Move row delete check logic for receiving to batch handler

tailbone/views/purchasing/receiving.py

@@ -84,7 +84,6 @@ class ReceivingBatchView(PurchasingBatchView):
 
     rows_editable = False
     rows_editable_but_not_directly = True
-    rows_deletable = True
 
     default_uom_is_case = True
 
@@ -379,24 +378,8 @@ class ReceivingBatchView(PurchasingBatchView):
         if not super(ReceivingBatchView, self).row_deletable(row):
             return False
 
-        batch = row.batch
-
-        # can always delete rows from truck dump parent
-        if batch.is_truck_dump_parent():
-            return True
-
-        # can always delete rows from truck dump child
-        elif batch.is_truck_dump_child():
-            return True
-
-        else: # okay, normal batch
-            if batch.order_quantities_known:
-                return False
-            else: # allow delete if receiving rom scratch
-                return True
-
-        # cannot delete row by default
-        return False
+        # otherwise let handler decide
+        return self.batch_handler.is_row_deletable(row)
 
     def get_instance_title(self, batch):
         title = super(ReceivingBatchView, self).get_instance_title(batch)