Stock transfer same location (#4757)

* Allow stock items to be transferred into the same location

* Add new code when moving into same location

* Update unit test

* Further unit test fixes

InvenTree/stock/models.py

@@ -1665,9 +1665,6 @@ class StockItem(InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, commo
         if location is None:
             # TODO - Raise appropriate error (cannot move to blank location)
             return False
-        elif self.location and (location.pk == self.location.pk) and (quantity == self.quantity):
-            # TODO - Raise appropriate error (cannot move to same location)
-            return False
 
         # Test for a partial movement
         if quantity < self.quantity:
@@ -1678,16 +1675,25 @@ class StockItem(InvenTreeBarcodeMixin, InvenTreeNotesMixin, MetadataMixin, commo
 
             return True
 
+        # Moving into the same location triggers a different history code
+        same_location = location == self.location
+
         self.location = location
 
         tracking_info = {}
 
+        tracking_code = StockHistoryCode.STOCK_MOVE
+
+        if same_location:
+            tracking_code = StockHistoryCode.STOCK_UPDATE
+        else:
+            tracking_info['location'] = location.pk
+
         self.add_tracking_entry(
-            StockHistoryCode.STOCK_MOVE,
+            tracking_code,
             user,
             notes=notes,
             deltas=tracking_info,
-            location=location,
         )
 
         self.save()

InvenTree/stock/tests.py

@@ -376,15 +376,14 @@ class StockTest(StockTestBase):
         self.assertEqual(track.notes, 'Moved to the bathroom')
 
     def test_self_move(self):
-        """Test moving stock to itself does not work."""
-        # Try to move an item to its current location (should fail)
+        """Test moving stock to its current location."""
         it = StockItem.objects.get(pk=1)
 
         n = it.tracking_info.count()
-        self.assertFalse(it.move(it.location, 'Moved to same place', None))
+        self.assertTrue(it.move(it.location, 'Moved to same place', None))
 
         # Ensure tracking info was not added
-        self.assertEqual(it.tracking_info.count(), n)
+        self.assertEqual(it.tracking_info.count(), n + 1)
 
     def test_partial_move(self):
         """Test partial stock moving."""