diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index ffc6a5cf3b3..8919d0bba6f 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -479,9 +479,7 @@ class PurchaseOrder(models.Model):
     @api.multi
     def action_set_date_planned(self):
         for order in self:
-            #DO NOT FORWARD PORT
-            for line in order.order_line:
-                line.update({'date_planned': order.date_planned})
+            order.order_line.update({'date_planned': order.date_planned})
 
 
 class PurchaseOrderLine(models.Model):