diff --git a/.github/workflows/python.yaml b/.github/workflows/python.yaml
new file mode 100644
index 0000000000..7e32685af1
--- /dev/null
+++ b/.github/workflows/python.yaml
@@ -0,0 +1,49 @@
+# Run python library tests whenever code is pushed to master
+
+name: Python Bindings
+
+on:
+  push:
+    branches:
+      - master
+
+  pull_request:
+    branches-ignore:
+      - l10*
+
+jobs:
+
+  python:
+    runs-on: ubuntu-latest
+
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      INVENTREE_DB_NAME: './test_db.sqlite'
+      INVENTREE_DB_ENGINE: 'sqlite3'
+      INVENTREE_DEBUG: info
+      INVENTREE_MEDIA_ROOT: ./media
+      INVENTREE_STATIC_ROOT: ./static
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+      - name: Install InvenTree
+        run: |
+          sudo apt-get update
+          sudo apt-get install python3-dev python3-pip python3-venv
+          pip3 install invoke
+          invoke install
+          invoke migrate
+      - name: Download Python Code
+        run: |
+          git clone --depth 1 https://github.com/inventree/inventree-python ./inventree-python
+      - name: Start Server
+        run: |
+          invoke import-records -f ./inventree-python/test/test_data.json
+          invoke server -a 127.0.0.1:8000 &
+          sleep 60
+      - name: Run Tests
+        run: |
+          cd inventree-python
+          invoke test
+  
\ No newline at end of file
diff --git a/InvenTree/InvenTree/api_tester.py b/InvenTree/InvenTree/api_tester.py
index eb92bd80c1..f0f33ad1a5 100644
--- a/InvenTree/InvenTree/api_tester.py
+++ b/InvenTree/InvenTree/api_tester.py
@@ -73,22 +73,50 @@ class InvenTreeAPITestCase(APITestCase):
                 ruleset.save()
                 break
 
-    def get(self, url, data={}, code=200):
+    def get(self, url, data={}, expected_code=200):
         """
         Issue a GET request
         """
 
         response = self.client.get(url, data, format='json')
 
-        self.assertEqual(response.status_code, code)
+        if expected_code is not None:
+            self.assertEqual(response.status_code, expected_code)
 
         return response
 
-    def post(self, url, data):
+    def post(self, url, data, expected_code=None):
         """
         Issue a POST request
         """
 
         response = self.client.post(url, data=data, format='json')
 
+        if expected_code is not None:
+            self.assertEqual(response.status_code, expected_code)
+
+        return response
+
+    def delete(self, url, expected_code=None):
+        """
+        Issue a DELETE request
+        """
+
+        response = self.client.delete(url)
+
+        if expected_code is not None:
+            self.assertEqual(response.status_code, expected_code)
+
+        return response
+
+    def patch(self, url, data, expected_code=None):
+        """
+        Issue a PATCH request
+        """
+
+        response = self.client.patch(url, data=data, format='json')
+
+        if expected_code is not None:
+            self.assertEqual(response.status_code, expected_code)
+
         return response
diff --git a/InvenTree/InvenTree/serializers.py b/InvenTree/InvenTree/serializers.py
index fa7674723c..2bc89ef637 100644
--- a/InvenTree/InvenTree/serializers.py
+++ b/InvenTree/InvenTree/serializers.py
@@ -6,12 +6,15 @@ Serializers used in various InvenTree apps
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from rest_framework import serializers
-
 import os
 
 from django.conf import settings
 from django.contrib.auth.models import User
+from django.core.exceptions import ValidationError as DjangoValidationError
+
+from rest_framework import serializers
+from rest_framework.fields import empty
+from rest_framework.exceptions import ValidationError
 
 
 class UserSerializer(serializers.ModelSerializer):
@@ -39,18 +42,34 @@ class InvenTreeModelSerializer(serializers.ModelSerializer):
     but also ensures that the underlying model class data are checked on validation.
     """
 
-    def validate(self, data):
+    def run_validation(self, data=empty):
         """ Perform serializer validation.
         In addition to running validators on the serializer fields,
         this class ensures that the underlying model is also validated.
         """
 
-        # Run any native validation checks first (may throw an ValidationError)
-        data = super(serializers.ModelSerializer, self).validate(data)
+        # Run any native validation checks first (may raise a ValidationError)
+        data = super().run_validation(data)
 
         # Now ensure the underlying model is correct
-        instance = self.Meta.model(**data)
-        instance.clean()
+
+        if not hasattr(self, 'instance') or self.instance is None:
+            # No instance exists (we are creating a new one)
+            instance = self.Meta.model(**data)
+        else:
+            # Instance already exists (we are updating!)
+            instance = self.instance
+
+            # Update instance fields
+            for attr, value in data.items():
+                setattr(instance, attr, value)
+
+        # Run a 'full_clean' on the model.
+        # Note that by default, DRF does *not* perform full model validation!
+        try:
+            instance.full_clean()
+        except (ValidationError, DjangoValidationError) as exc:
+            raise ValidationError(detail=serializers.as_serializer_error(exc))
 
         return data
 
diff --git a/InvenTree/InvenTree/tasks.py b/InvenTree/InvenTree/tasks.py
index d45df99152..4fb78cfbab 100644
--- a/InvenTree/InvenTree/tasks.py
+++ b/InvenTree/InvenTree/tasks.py
@@ -80,7 +80,7 @@ def heartbeat():
 
     try:
         from django_q.models import Success
-        logger.warning("Could not perform heartbeat task - App registry not ready")
+        logger.info("Could not perform heartbeat task - App registry not ready")
     except AppRegistryNotReady:
         return
 
@@ -105,7 +105,7 @@ def delete_successful_tasks():
     try:
         from django_q.models import Success
     except AppRegistryNotReady:
-        logger.warning("Could not perform 'delete_successful_tasks' - App registry not ready")
+        logger.info("Could not perform 'delete_successful_tasks' - App registry not ready")
         return
 
     threshold = datetime.now() - timedelta(days=30)
@@ -126,6 +126,7 @@ def check_for_updates():
         import common.models
     except AppRegistryNotReady:
         # Apps not yet loaded!
+        logger.info("Could not perform 'check_for_updates' - App registry not ready")
         return
 
     response = requests.get('https://api.github.com/repos/inventree/inventree/releases/latest')
@@ -172,6 +173,7 @@ def update_exchange_rates():
         from django.conf import settings
     except AppRegistryNotReady:
         # Apps not yet loaded!
+        logger.info("Could not perform 'update_exchange_rates' - App registry not ready")
         return
     except:
         # Other error?
diff --git a/InvenTree/build/migrations/0029_auto_20210601_1525.py b/InvenTree/build/migrations/0029_auto_20210601_1525.py
index c5ea04b5c9..e8b2d58947 100644
--- a/InvenTree/build/migrations/0029_auto_20210601_1525.py
+++ b/InvenTree/build/migrations/0029_auto_20210601_1525.py
@@ -40,7 +40,8 @@ def assign_bom_items(apps, schema_editor):
         except BomItem.DoesNotExist:
             pass
 
-    print(f"Assigned BomItem for {count_valid}/{count_total} entries")
+    if count_total > 0:
+        print(f"Assigned BomItem for {count_valid}/{count_total} entries")
 
 
 def unassign_bom_items(apps, schema_editor):
diff --git a/InvenTree/company/migrations/0026_auto_20201110_1011.py b/InvenTree/company/migrations/0026_auto_20201110_1011.py
index c6be37b967..20ec7d2f6f 100644
--- a/InvenTree/company/migrations/0026_auto_20201110_1011.py
+++ b/InvenTree/company/migrations/0026_auto_20201110_1011.py
@@ -71,7 +71,8 @@ def migrate_currencies(apps, schema_editor):
 
         count += 1
 
-    print(f"Updated {count} SupplierPriceBreak rows")
+    if count > 0:
+        print(f"Updated {count} SupplierPriceBreak rows")
 
 def reverse_currencies(apps, schema_editor):
     """
diff --git a/InvenTree/company/test_api.py b/InvenTree/company/test_api.py
index c43280c76c..d5cb573f47 100644
--- a/InvenTree/company/test_api.py
+++ b/InvenTree/company/test_api.py
@@ -119,7 +119,9 @@ class ManufacturerTest(InvenTreeAPITestCase):
         data = {
             'MPN': 'MPN-TEST-123',
         }
+        
         response = self.client.patch(url, data, format='json')
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['MPN'], 'MPN-TEST-123')
 
diff --git a/InvenTree/order/api.py b/InvenTree/order/api.py
index 6661bd568b..c22d76a52e 100644
--- a/InvenTree/order/api.py
+++ b/InvenTree/order/api.py
@@ -157,7 +157,7 @@ class POList(generics.ListCreateAPIView):
     ordering = '-creation_date'
 
 
-class PODetail(generics.RetrieveUpdateAPIView):
+class PODetail(generics.RetrieveUpdateDestroyAPIView):
     """ API endpoint for detail view of a PurchaseOrder object """
 
     queryset = PurchaseOrder.objects.all()
@@ -382,7 +382,7 @@ class SOList(generics.ListCreateAPIView):
     ordering = '-creation_date'
 
 
-class SODetail(generics.RetrieveUpdateAPIView):
+class SODetail(generics.RetrieveUpdateDestroyAPIView):
     """
     API endpoint for detail view of a SalesOrder object.
     """
diff --git a/InvenTree/order/serializers.py b/InvenTree/order/serializers.py
index 9efbf947bb..821e8bf343 100644
--- a/InvenTree/order/serializers.py
+++ b/InvenTree/order/serializers.py
@@ -93,8 +93,10 @@ class POSerializer(InvenTreeModelSerializer):
         ]
 
         read_only_fields = [
-            'reference',
             'status'
+            'issue_date',
+            'complete_date',
+            'creation_date',
         ]
 
 
@@ -110,8 +112,9 @@ class POLineItemSerializer(InvenTreeModelSerializer):
             self.fields.pop('part_detail')
             self.fields.pop('supplier_part_detail')
 
-    quantity = serializers.FloatField()
-    received = serializers.FloatField()
+    # TODO: Once https://github.com/inventree/InvenTree/issues/1687 is fixed, remove default values
+    quantity = serializers.FloatField(default=1)
+    received = serializers.FloatField(default=0)
 
     part_detail = PartBriefSerializer(source='get_base_part', many=False, read_only=True)
     supplier_part_detail = SupplierPartSerializer(source='part', many=False, read_only=True)
@@ -226,8 +229,9 @@ class SalesOrderSerializer(InvenTreeModelSerializer):
         ]
 
         read_only_fields = [
-            'reference',
-            'status'
+            'status',
+            'creation_date',
+            'shipment_date',
         ]
 
 
@@ -313,7 +317,9 @@ class SOLineItemSerializer(InvenTreeModelSerializer):
     part_detail = PartBriefSerializer(source='part', many=False, read_only=True)
     allocations = SalesOrderAllocationSerializer(many=True, read_only=True)
 
-    quantity = serializers.FloatField()
+    # TODO: Once https://github.com/inventree/InvenTree/issues/1687 is fixed, remove default values
+    quantity = serializers.FloatField(default=1)
+
     allocated = serializers.FloatField(source='allocated_quantity', read_only=True)
     fulfilled = serializers.FloatField(source='fulfilled_quantity', read_only=True)
     sale_price_string = serializers.CharField(source='sale_price', read_only=True)
diff --git a/InvenTree/order/test_api.py b/InvenTree/order/test_api.py
index ee77f429e1..24ca8581d9 100644
--- a/InvenTree/order/test_api.py
+++ b/InvenTree/order/test_api.py
@@ -110,6 +110,96 @@ class PurchaseOrderTest(OrderTest):
 
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
+    def test_po_operations(self):
+        """
+        Test that we can create / edit and delete a PurchaseOrder via the API
+        """
+
+        n = PurchaseOrder.objects.count()
+
+        url = reverse('api-po-list')
+
+        # Initially we do not have "add" permission for the PurchaseOrder model,
+        # so this POST request should return 403
+        response = self.post(
+            url,
+            {
+                'supplier': 1,
+                'reference': '123456789-xyz',
+                'description': 'PO created via the API',
+            },
+            expected_code=403
+        )
+
+        # And no new PurchaseOrder objects should have been created
+        self.assertEqual(PurchaseOrder.objects.count(), n)
+
+        # Ok, now let's give this user the correct permission
+        self.assignRole('purchase_order.add')
+
+        # Initially we do not have "add" permission for the PurchaseOrder model,
+        # so this POST request should return 403
+        response = self.post(
+            url,
+            {
+                'supplier': 1,
+                'reference': '123456789-xyz',
+                'description': 'PO created via the API',
+            },
+            expected_code=201
+        )
+
+        self.assertEqual(PurchaseOrder.objects.count(), n + 1)
+
+        pk = response.data['pk']
+
+        # Try to create a PO with identical reference (should fail!)
+        response = self.post(
+            url,
+            {
+                'supplier': 1,
+                'reference': '123456789-xyz',
+                'description': 'A different description',
+            },
+            expected_code=400
+        )
+
+        self.assertEqual(PurchaseOrder.objects.count(), n + 1)
+
+        url = reverse('api-po-detail', kwargs={'pk': pk})
+
+        # Get detail info!
+        response = self.get(url)
+        self.assertEqual(response.data['pk'], pk)
+        self.assertEqual(response.data['reference'], '123456789-xyz')
+
+        # Try to alter (edit) the PurchaseOrder
+        response = self.patch(
+            url,
+            {
+                'reference': '12345-abc',
+            },
+            expected_code=200
+        )
+
+        # Reference should have changed
+        self.assertEqual(response.data['reference'], '12345-abc')
+
+        # Now, let's try to delete it!
+        # Initially, we do *not* have the required permission!
+        response = self.delete(url, expected_code=403)
+
+        # Now, add the "delete" permission!
+        self.assignRole("purchase_order.delete")
+
+        response = self.delete(url, expected_code=204)
+
+        # Number of PurchaseOrder objects should have decreased
+        self.assertEqual(PurchaseOrder.objects.count(), n)
+
+        # And if we try to access the detail view again, it has gone
+        response = self.get(url, expected_code=404)
+
 
 class SalesOrderTest(OrderTest):
     """
@@ -158,8 +248,6 @@ class SalesOrderTest(OrderTest):
 
         response = self.get(url)
 
-        self.assertEqual(response.status_code, 200)
-
         data = response.data
 
         self.assertEqual(data['pk'], 1)
@@ -168,6 +256,87 @@ class SalesOrderTest(OrderTest):
 
         url = reverse('api-so-attachment-list')
 
-        response = self.get(url)
+        self.get(url)
 
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+    def test_so_operations(self):
+        """
+        Test that we can create / edit and delete a SalesOrder via the API
+        """
+
+        n = SalesOrder.objects.count()
+
+        url = reverse('api-so-list')
+
+        # Initially we do not have "add" permission for the SalesOrder model,
+        # so this POST request should return 403 (denied)
+        response = self.post(
+            url,
+            {
+                'customer': 4,
+                'reference': '12345',
+                'description': 'Sales order',
+            },
+            expected_code=403,
+        )
+
+        self.assignRole('sales_order.add')
+
+        # Now we should be able to create a SalesOrder via the API
+        response = self.post(
+            url,
+            {
+                'customer': 4,
+                'reference': '12345',
+                'description': 'Sales order',
+            },
+            expected_code=201
+        )
+
+        # Check that the new order has been created
+        self.assertEqual(SalesOrder.objects.count(), n + 1)
+
+        # Grab the PK for the newly created SalesOrder
+        pk = response.data['pk']
+
+        # Try to create a SO with identical reference (should fail)
+        response = self.post(
+            url,
+            {
+                'customer': 4,
+                'reference': '12345',
+                'description': 'Another sales order',
+            },
+            expected_code=400
+        )
+
+        url = reverse('api-so-detail', kwargs={'pk': pk})
+
+        # Extract detail info for the SalesOrder
+        response = self.get(url)
+        self.assertEqual(response.data['reference'], '12345')
+
+        # Try to alter (edit) the SalesOrder
+        response = self.patch(
+            url,
+            {
+                'reference': '12345-a',
+            },
+            expected_code=200
+        )
+
+        # Reference should have changed
+        self.assertEqual(response.data['reference'], '12345-a')
+
+        # Now, let's try to delete this SalesOrder
+        # Initially, we do not have the required permission
+        response = self.delete(url, expected_code=403)
+
+        self.assignRole('sales_order.delete')
+
+        response = self.delete(url, expected_code=204)
+
+        # Check that the number of sales orders has decreased
+        self.assertEqual(SalesOrder.objects.count(), n)
+
+        # And the resource should no longer be available
+        response = self.get(url, expected_code=404)
diff --git a/InvenTree/part/fixtures/part.yaml b/InvenTree/part/fixtures/part.yaml
index 508a1577bb..3c24690efc 100644
--- a/InvenTree/part/fixtures/part.yaml
+++ b/InvenTree/part/fixtures/part.yaml
@@ -6,7 +6,7 @@
     name: 'M2x4 LPHS'
     description: 'M2x4 low profile head screw'
     category: 8
-    link: www.acme.com/parts/m2x4lphs
+    link: http://www.acme.com/parts/m2x4lphs
     tree_id: 0
     purchaseable: True
     level: 0
@@ -56,6 +56,7 @@
   fields:
     name: 'C_22N_0805'
     description: '22nF capacitor in 0805 package'
+    purchaseable: true
     category: 3
     tree_id: 0
     level: 0
diff --git a/InvenTree/part/migrations/0056_auto_20201110_1125.py b/InvenTree/part/migrations/0056_auto_20201110_1125.py
index b382dded71..862f9411c8 100644
--- a/InvenTree/part/migrations/0056_auto_20201110_1125.py
+++ b/InvenTree/part/migrations/0056_auto_20201110_1125.py
@@ -71,7 +71,8 @@ def migrate_currencies(apps, schema_editor):
 
         count += 1
 
-    print(f"Updated {count} SupplierPriceBreak rows")
+    if count > 0:
+        print(f"Updated {count} SupplierPriceBreak rows")
 
 def reverse_currencies(apps, schema_editor):
     """
diff --git a/InvenTree/part/migrations/0068_part_unique_part.py b/InvenTree/part/migrations/0068_part_unique_part.py
new file mode 100644
index 0000000000..2e87fc7b2a
--- /dev/null
+++ b/InvenTree/part/migrations/0068_part_unique_part.py
@@ -0,0 +1,17 @@
+# Generated by Django 3.2.4 on 2021-06-21 23:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0067_partinternalpricebreak'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='part',
+            constraint=models.UniqueConstraint(fields=('name', 'IPN', 'revision'), name='unique_part'),
+        ),
+    ]
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 8aa370a7ae..8ddf049216 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -321,6 +321,9 @@ class Part(MPTTModel):
         verbose_name = _("Part")
         verbose_name_plural = _("Parts")
         ordering = ['name', ]
+        constraints = [
+            UniqueConstraint(fields=['name', 'IPN', 'revision'], name='unique_part')
+        ]
 
     class MPTTMeta:
         # For legacy reasons the 'variant_of' field is used to indicate the MPTT parent
@@ -379,7 +382,7 @@ class Part(MPTTModel):
                     logger.info(f"Deleting unused image file '{previous.image}'")
                     previous.image.delete(save=False)
 
-        self.clean()
+        self.full_clean()
 
         super().save(*args, **kwargs)
 
@@ -642,23 +645,6 @@ class Part(MPTTModel):
                     'IPN': _('Duplicate IPN not allowed in part settings'),
                 })
 
-        # Part name uniqueness should be case insensitive
-        try:
-            parts = Part.objects.exclude(id=self.id).filter(
-                name__iexact=self.name,
-                IPN__iexact=self.IPN,
-                revision__iexact=self.revision)
-
-            if parts.exists():
-                msg = _("Part must be unique for name, IPN and revision")
-                raise ValidationError({
-                    "name": msg,
-                    "IPN": msg,
-                    "revision": msg,
-                })
-        except Part.DoesNotExist:
-            pass
-
     def clean(self):
         """
         Perform cleaning operations for the Part model
@@ -671,8 +657,6 @@ class Part(MPTTModel):
 
         super().clean()
 
-        self.validate_unique()
-
         if self.trackable:
             for part in self.get_used_in().all():
 
diff --git a/InvenTree/part/test_api.py b/InvenTree/part/test_api.py
index 0f5f59d3a3..176149c880 100644
--- a/InvenTree/part/test_api.py
+++ b/InvenTree/part/test_api.py
@@ -1,8 +1,10 @@
+# -*- coding: utf-8 -*-
+
 from rest_framework import status
 
 from django.urls import reverse
 
-from part.models import Part
+from part.models import Part, PartCategory
 from stock.models import StockItem
 from company.models import Company
 
@@ -230,6 +232,18 @@ class PartAPITest(InvenTreeAPITestCase):
         response = self.client.get(url, data={'part': 10004})
         self.assertEqual(len(response.data), 7)
 
+        # Try to post a new object (missing description)
+        response = self.client.post(
+            url,
+            data={
+                'part': 10000,
+                'test_name': 'My very first test',
+                'required': False,
+            }
+        )
+
+        self.assertEqual(response.status_code, 400)
+
         # Try to post a new object (should succeed)
         response = self.client.post(
             url,
@@ -237,6 +251,7 @@ class PartAPITest(InvenTreeAPITestCase):
                 'part': 10000,
                 'test_name': 'New Test',
                 'required': True,
+                'description': 'a test description'
             },
             format='json',
         )
@@ -248,7 +263,8 @@ class PartAPITest(InvenTreeAPITestCase):
             url,
             data={
                 'part': 10004,
-                'test_name': "   newtest"
+                'test_name': "   newtest",
+                'description': 'dafsdf',
             },
             format='json',
         )
@@ -293,6 +309,171 @@ class PartAPITest(InvenTreeAPITestCase):
             self.assertEqual(len(data['results']), n)
 
 
+class PartDetailTests(InvenTreeAPITestCase):
+    """
+    Test that we can create / edit / delete Part objects via the API
+    """
+
+    fixtures = [
+        'category',
+        'part',
+        'location',
+        'bom',
+        'test_templates',
+    ]
+
+    roles = [
+        'part.change',
+        'part.add',
+        'part.delete',
+        'part_category.change',
+        'part_category.add',
+    ]
+
+    def setUp(self):
+        super().setUp()
+
+    def test_part_operations(self):
+        n = Part.objects.count()
+
+        # Create a part
+        response = self.client.post(
+            reverse('api-part-list'),
+            {
+                'name': 'my test api part',
+                'description': 'a part created with the API',
+                'category': 1,
+            }
+        )
+
+        self.assertEqual(response.status_code, 201)
+
+        pk = response.data['pk']
+
+        # Check that a new part has been added
+        self.assertEqual(Part.objects.count(), n + 1)
+
+        part = Part.objects.get(pk=pk)
+
+        self.assertEqual(part.name, 'my test api part')
+
+        # Edit the part
+        url = reverse('api-part-detail', kwargs={'pk': pk})
+
+        # Let's change the name of the part
+
+        response = self.client.patch(url, {
+            'name': 'a new better name',
+        })
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data['pk'], pk)
+        self.assertEqual(response.data['name'], 'a new better name')
+
+        part = Part.objects.get(pk=pk)
+
+        # Name has been altered
+        self.assertEqual(part.name, 'a new better name')
+
+        # Part count should not have changed
+        self.assertEqual(Part.objects.count(), n + 1)
+
+        # Now, try to set the name to the *same* value
+        # 2021-06-22 this test is to check that the "duplicate part" checks don't do strange things
+        response = self.client.patch(url, {
+            'name': 'a new better name',
+        })
+
+        self.assertEqual(response.status_code, 200)
+
+        # Try to remove the part
+        response = self.client.delete(url)
+    
+        self.assertEqual(response.status_code, 204)
+
+        # Part count should have reduced
+        self.assertEqual(Part.objects.count(), n)
+
+    def test_duplicates(self):
+        """
+        Check that trying to create 'duplicate' parts results in errors
+        """
+
+        # Create a part
+        response = self.client.post(reverse('api-part-list'), {
+            'name': 'part',
+            'description': 'description',
+            'IPN': 'IPN-123',
+            'category': 1,
+            'revision': 'A',
+        })
+
+        self.assertEqual(response.status_code, 201)
+
+        n = Part.objects.count()
+
+        # Check that we cannot create a duplicate in a different category
+        response = self.client.post(reverse('api-part-list'), {
+            'name': 'part',
+            'description': 'description',
+            'IPN': 'IPN-123',
+            'category': 2,
+            'revision': 'A',
+        })
+
+        self.assertEqual(response.status_code, 400)
+
+        # Check that only 1 matching part exists
+        parts = Part.objects.filter(
+            name='part',
+            description='description',
+            IPN='IPN-123'
+        )
+
+        self.assertEqual(parts.count(), 1)
+
+        # A new part should *not* have been created
+        self.assertEqual(Part.objects.count(), n)
+
+        # But a different 'revision' *can* be created
+        response = self.client.post(reverse('api-part-list'), {
+            'name': 'part',
+            'description': 'description',
+            'IPN': 'IPN-123',
+            'category': 2,
+            'revision': 'B',
+        })
+
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(Part.objects.count(), n + 1)
+
+        # Now, check that we cannot *change* an existing part to conflict
+        pk = response.data['pk']
+
+        url = reverse('api-part-detail', kwargs={'pk': pk})
+
+        # Attempt to alter the revision code
+        response = self.client.patch(
+            url,
+            {
+                'revision': 'A',
+            },
+            format='json',
+        )
+
+        self.assertEqual(response.status_code, 400)
+
+        # But we *can* change it to a unique revision code
+        response = self.client.patch(
+            url,
+            {
+                'revision': 'C',
+            }
+        )
+
+        self.assertEqual(response.status_code, 200)
+
+
 class PartAPIAggregationTest(InvenTreeAPITestCase):
     """
     Tests to ensure that the various aggregation annotations are working correctly...
@@ -319,6 +500,8 @@ class PartAPIAggregationTest(InvenTreeAPITestCase):
         # Add a new part
         self.part = Part.objects.create(
             name='Banana',
+            description='This is a banana',
+            category=PartCategory.objects.get(pk=1),
         )
 
         # Create some stock items associated with the part
diff --git a/InvenTree/part/test_part.py b/InvenTree/part/test_part.py
index 2bc24c3a99..e30c80549f 100644
--- a/InvenTree/part/test_part.py
+++ b/InvenTree/part/test_part.py
@@ -11,7 +11,7 @@ from django.core.exceptions import ValidationError
 
 import os
 
-from .models import Part, PartTestTemplate
+from .models import Part, PartCategory, PartTestTemplate
 from .models import rename_part_image, match_part_names
 from .templatetags import inventree_extras
 
@@ -78,6 +78,61 @@ class PartTest(TestCase):
         p = Part.objects.get(pk=100)
         self.assertEqual(str(p), "BOB | Bob | A2 - Can we build it?")
 
+    def test_duplicate(self):
+        """
+        Test that we cannot create a "duplicate" Part
+        """
+
+        n = Part.objects.count()
+
+        cat = PartCategory.objects.get(pk=1)
+
+        Part.objects.create(
+            category=cat,
+            name='part',
+            description='description',
+            IPN='IPN',
+            revision='A',
+        )
+
+        self.assertEqual(Part.objects.count(), n + 1)
+
+        part = Part(
+            category=cat,
+            name='part',
+            description='description',
+            IPN='IPN',
+            revision='A',
+        )
+
+        with self.assertRaises(ValidationError):
+            part.validate_unique()
+
+        try:
+            part.save()
+            self.assertTrue(False)
+        except:
+            pass
+
+        self.assertEqual(Part.objects.count(), n + 1)
+
+        # But we should be able to create a part with a different revision
+        part_2 = Part.objects.create(
+            category=cat,
+            name='part',
+            description='description',
+            IPN='IPN',
+            revision='B',
+        )
+
+        self.assertEqual(Part.objects.count(), n + 2)
+
+        # Now, check that we cannot *change* part_2 to conflict
+        part_2.revision = 'A'
+
+        with self.assertRaises(ValidationError):
+            part_2.validate_unique()
+
     def test_metadata(self):
         self.assertEqual(self.r1.name, 'R_2K2_0805')
         self.assertEqual(self.r1.get_absolute_url(), '/part/3/')
@@ -277,21 +332,24 @@ class PartSettingsTest(TestCase):
         """
 
         # Create a part
-        Part.objects.create(name='Hello', description='A thing', IPN='IPN123')
+        Part.objects.create(name='Hello', description='A thing', IPN='IPN123', revision='A')
 
         # Attempt to create a duplicate item (should fail)
         with self.assertRaises(ValidationError):
-            Part.objects.create(name='Hello', description='A thing', IPN='IPN123')
+            part = Part(name='Hello', description='A thing', IPN='IPN123', revision='A')
+            part.validate_unique()
 
         # Attempt to create item with duplicate IPN (should be allowed by default)
         Part.objects.create(name='Hello', description='A thing', IPN='IPN123', revision='B')
 
         # And attempt again with the same values (should fail)
         with self.assertRaises(ValidationError):
-            Part.objects.create(name='Hello', description='A thing', IPN='IPN123', revision='B')
+            part = Part(name='Hello', description='A thing', IPN='IPN123', revision='B')
+            part.validate_unique()
 
         # Now update the settings so duplicate IPN values are *not* allowed
         InvenTreeSetting.set_setting('PART_ALLOW_DUPLICATE_IPN', False, self.user)
 
         with self.assertRaises(ValidationError):
-            Part.objects.create(name='Hello', description='A thing', IPN='IPN123', revision='C')
+            part = Part(name='Hello', description='A thing', IPN='IPN123', revision='C')
+            part.full_clean()
diff --git a/InvenTree/stock/migrations/0061_auto_20210511_0911.py b/InvenTree/stock/migrations/0061_auto_20210511_0911.py
index 0ab37250c8..ba0ecc5207 100644
--- a/InvenTree/stock/migrations/0061_auto_20210511_0911.py
+++ b/InvenTree/stock/migrations/0061_auto_20210511_0911.py
@@ -199,7 +199,8 @@ def update_history(apps, schema_editor):
                 update_count += 1
 
 
-    print(f"\n==========================\nUpdated {update_count} StockItemHistory entries")
+    if update_count > 0:
+        print(f"\n==========================\nUpdated {update_count} StockItemHistory entries")
 
 
 def reverse_update(apps, schema_editor):
diff --git a/InvenTree/stock/migrations/0064_auto_20210621_1724.py b/InvenTree/stock/migrations/0064_auto_20210621_1724.py
index 71314f366c..361ad02c80 100644
--- a/InvenTree/stock/migrations/0064_auto_20210621_1724.py
+++ b/InvenTree/stock/migrations/0064_auto_20210621_1724.py
@@ -26,7 +26,8 @@ def extract_purchase_price(apps, schema_editor):
     # Find all the StockItem objects without a purchase_price which point to a PurchaseOrder
     items = StockItem.objects.filter(purchase_price=None).exclude(purchase_order=None)
 
-    print(f"Found {items.count()} stock items with missing purchase price information")
+    if items.count() > 0:
+        print(f"Found {items.count()} stock items with missing purchase price information")
 
     update_count = 0
 
@@ -56,7 +57,8 @@ def extract_purchase_price(apps, schema_editor):
 
                     break
 
-    print(f"Updated pricing for {update_count} stock items")
+    if update_count > 0:
+        print(f"Updated pricing for {update_count} stock items")
 
 def reverse_operation(apps, schema_editor):
     """