Require invoice parser selection for new truck dump child from invoice

tailbone/views/purchasing/receiving.py

@@ -592,6 +592,9 @@ class ReceivingBatchView(PurchasingBatchView):
         f.set_readonly('truck_dump_parent')
         f.set_renderer('truck_dump_parent', self.render_truck_dump_parent)
 
+        # invoice_parser_key
+        f.set_required('invoice_parser_key')
+
     def render_truck_dump_parent(self, batch, field):
         truck_dump = self.get_instance()
         text = six.text_type(truck_dump)