Draft API endpoint RUD class

- RUD = Retrieve / Update / Destroy
- When issuing an Update command, the validity is checked but the model object is only saved if the POST data has "_is_final": true

InvenTree/stock/serializers.py

@@ -56,7 +56,7 @@ class StockItemSerializer(serializers.ModelSerializer):
             'stocktake_date',
             'stocktake_user',
             'updated',
-            'quantity',
+            #'quantity',
         ]