diff --git a/src/backend/InvenTree/build/models.py b/src/backend/InvenTree/build/models.py
index e633c3c791f..21e1977d10f 100644
--- a/src/backend/InvenTree/build/models.py
+++ b/src/backend/InvenTree/build/models.py
@@ -940,7 +940,7 @@ def create_build_output(self, quantity, **kwargs):
                 StockHistoryCode.BUILD_OUTPUT_CREATED,
                 user,
                 deltas={
-                    'quantity': quantity,
+                    'quantity': float(quantity),
                     'buildorder': self.pk,
                     'batch': batch,
                     'location': location.pk if location else None
diff --git a/src/backend/InvenTree/build/test_api.py b/src/backend/InvenTree/build/test_api.py
index f3feee051ad..222d93787f5 100644
--- a/src/backend/InvenTree/build/test_api.py
+++ b/src/backend/InvenTree/build/test_api.py
@@ -1269,6 +1269,86 @@ def test_sub_builds(self):
         self.assertEqual(len(builds), 20)
 
 
+class BuildOutputCreateTest(BuildAPITest):
+    """Unit test for creating build output via API."""
+
+    def test_create_serialized_output(self):
+        """Create a serialized build output via the API."""
+
+        build_id = 1
+
+        url = reverse('api-build-output-create', kwargs={'pk': build_id})
+
+        build = Build.objects.get(pk=build_id)
+        part = build.part
+
+        n_outputs = build.output_count
+        n_items = part.stock_items.count()
+
+        # Post with invalid data
+        response = self.post(
+            url,
+            data={
+                'quantity': 10,
+                'serial_numbers': '1-100',
+            },
+            expected_code=400
+        )
+
+        self.assertIn('Group range 1-100 exceeds allowed quantity (10)', str(response.data['serial_numbers']))
+
+        # Build outputs have not increased
+        self.assertEqual(n_outputs, build.output_count)
+
+        # Stock items have not increased
+        self.assertEqual(n_items, part.stock_items.count())
+
+        response = self.post(
+            url,
+            data={
+                'quantity': 5,
+                'serial_numbers': '1,2,3-5',
+            },
+            expected_code=201
+        )
+
+        # Build outputs have incdeased
+        self.assertEqual(n_outputs + 5, build.output_count)
+
+        # Stock items have increased
+        self.assertEqual(n_items + 5, part.stock_items.count())
+
+        # Serial numbers have been created
+        for sn in range(1, 6):
+            self.assertTrue(part.stock_items.filter(serial=sn).exists())
+
+    def test_create_unserialized_output(self):
+        """Create an unserialized build output via the API."""
+
+        build_id = 1
+        url = reverse('api-build-output-create', kwargs={'pk': build_id})
+
+        build = Build.objects.get(pk=build_id)
+        part = build.part
+
+        n_outputs = build.output_count
+        n_items = part.stock_items.count()
+
+        # Create a single new output
+        self.post(
+            url,
+            data={
+                'quantity': 10,
+            },
+            expected_code=201
+        )
+
+        # Build outputs have increased
+        self.assertEqual(n_outputs + 1, build.output_count)
+
+        # Stock items have increased
+        self.assertEqual(n_items + 1, part.stock_items.count())
+
 class BuildOutputScrapTest(BuildAPITest):
     """Unit tests for scrapping build outputs"""
 
diff --git a/src/backend/InvenTree/order/models.py b/src/backend/InvenTree/order/models.py
index 7901cd31d2b..91186be139d 100644
--- a/src/backend/InvenTree/order/models.py
+++ b/src/backend/InvenTree/order/models.py
@@ -873,7 +873,7 @@ def receive_line_item(
                     deltas=tracking_info,
                     location=location,
                     purchaseorder=self,
-                    quantity=quantity,
+                    quantity=float(quantity),
                 )
 
         # Update the number of parts received against the particular line item