testInventory.py: deploy universal function to gain compatibility.

product/ERP5/tests/testInventory.py

@@ -2742,8 +2742,8 @@ class TestInventory(TestOrderMixin, ERP5TypeTestCase):
       Make sure that changing workflow state after delivered changes
       records in stock table.
     """
-    delivered_state = self.portal.portal_workflow.inventory_workflow.states['delivered']
-    delivered_state.transitions = delivered_state.transitions + ('cancel',)
+    delivered_state = self.portal.portal_workflow.inventory_workflow.getStateValueList()['delivered']
+    delivered_state.addPossibleTransition('cancel')
 
     self.commit()