diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index bdc00789d20..53263763570 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -970,7 +970,7 @@ class purchase_order_line(osv.osv):
     def copy_data(self, cr, uid, id, default=None, context=None):
         if not default:
             default = {}
-        default.update({'state':'draft', 'move_ids':[],'invoiced':0,'invoice_lines':[]})
+        default.update({'state':'draft', 'move_ids':[],'invoiced':0,'invoice_lines':[],'procurement_ids': False})
         return super(purchase_order_line, self).copy_data(cr, uid, id, default, context)
 
     def unlink(self, cr, uid, ids, context=None):