diff --git a/stock.py b/stock.py
index 2c940f4d06..a99fc54b29 100644
--- a/stock.py
+++ b/stock.py
@@ -204,4 +204,9 @@ class CreateShipping(Wizard):
     start = StateTransition()
 
     def transition_start(self):
+        pool = Pool()
+        ShipmentOut = pool.get('stock.shipment.out')
+        shipment = ShipmentOut(Transaction().context['active_id'])
+        method_name = 'validate_packing_%' % shipment.carrier.shipping_service
+        getattr(shipment, method_name)()
         return 'end'