The cancellation of move should not compute cost price

because such move can not be done (prevented by _deny_modify_done_cancel).

issue4107
review11421002

move.py

@@ -632,22 +632,7 @@ class Move(Workflow, ModelSQL, ModelView):
     @ModelView.button
     @Workflow.transition('cancel')
     def cancel(cls, moves):
-        pool = Pool()
-        Date = pool.get('ir.date')
-
-        today = Date.today()
-        for move in moves:
-            move.effective_date = today
-            if (move.from_location.type in ('supplier', 'production')
-                    and move.to_location.type == 'storage'
-                    and move.product.cost_price_method == 'average'):
-                move._update_product_cost_price('out')
-            elif (move.to_location.type == 'supplier'
-                    and move.from_location.type == 'storage'
-                    and move.product.cost_price_method == 'average'):
-                move._update_product_cost_price('in')
-            move.effective_date = None
-            move.save()
+        pass
 
     @classmethod
     def create(cls, vlist):