diff --git a/src/backend/InvenTree/common/serializers.py b/src/backend/InvenTree/common/serializers.py
index 43532206e0..fc7e6ddcad 100644
--- a/src/backend/InvenTree/common/serializers.py
+++ b/src/backend/InvenTree/common/serializers.py
@@ -798,7 +798,7 @@ class ParameterSerializer(
         mixin_class=InvenTreeParameterMixin,
         label=_('Model Type'),
         default='',
-        required=False,
+        allow_null=False,
     )
 
     updated_by_detail = enable_filter(
diff --git a/src/backend/InvenTree/common/test_api.py b/src/backend/InvenTree/common/test_api.py
new file mode 100644
index 0000000000..db776f3209
--- /dev/null
+++ b/src/backend/InvenTree/common/test_api.py
@@ -0,0 +1,69 @@
+"""API unit tests for InvenTree common functionality."""
+
+from django.urls import reverse
+
+from InvenTree.unit_test import InvenTreeAPITestCase
+
+
+class ParameterAPITests(InvenTreeAPITestCase):
+    """Tests for the Parameter API."""
+
+    roles = 'all'
+
+    def test_template_options(self):
+        """Test OPTIONS information for the ParameterTemplate API endpoint."""
+        url = reverse('api-parameter-template-list')
+
+        options = self.options(url)
+        actions = options.data['actions']['GET']
+
+        for field in [
+            'pk',
+            'name',
+            'units',
+            'description',
+            'model_type',
+            'selectionlist',
+            'enabled',
+        ]:
+            self.assertIn(
+                field,
+                actions.keys(),
+                f'Field "{field}" missing from ParameterTemplate API!',
+            )
+
+        model_types = [act['value'] for act in actions['model_type']['choices']]
+
+        for mdl in [
+            'part.part',
+            'build.build',
+            'company.company',
+            'order.purchaseorder',
+        ]:
+            self.assertIn(
+                mdl,
+                model_types,
+                f'Model type "{mdl}" missing from ParameterTemplate API!',
+            )
+
+    def test_parameter_options(self):
+        """Test OPTIONS information for the Parameter API endpoint."""
+        url = reverse('api-parameter-list')
+
+        options = self.options(url)
+        actions = options.data['actions']['GET']
+
+        for field in [
+            'pk',
+            'template',
+            'model_type',
+            'model_id',
+            'data',
+            'data_numeric',
+        ]:
+            self.assertIn(
+                field, actions.keys(), f'Field "{field}" missing from Parameter API!'
+            )
+
+        self.assertFalse(actions['data']['read_only'])
+        self.assertFalse(actions['model_type']['read_only'])