Ensure PartParameterTemplate name is unique

InvenTree/part/migrations/0018_auto_20190907_0941.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.4 on 2019-09-07 09:41
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0017_bomitem_checksum'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='partparametertemplate',
+            name='name',
+            field=models.CharField(help_text='Parameter Name', max_length=100, unique=True),
+        ),
+    ]

InvenTree/part/models.py

@@ -1068,7 +1068,7 @@ class PartParameterTemplate(models.Model):
         """ Return the number of instances of this Parameter Template """
         return self.instances.count()
 
-    name = models.CharField(max_length=100, help_text='Parameter Name')
+    name = models.CharField(max_length=100, help_text='Parameter Name', unique=True)
 
     units = models.CharField(max_length=25, help_text='Parameter Units', blank=True)