diff --git a/addons/purchase_requisition/purchase_requisition.py b/addons/purchase_requisition/purchase_requisition.py
index b5be1a07066..d10d440b05a 100644
--- a/addons/purchase_requisition/purchase_requisition.py
+++ b/addons/purchase_requisition/purchase_requisition.py
@@ -82,9 +82,9 @@ class purchase_requisition(osv.osv):
         purchase_ids = []
         for tender in self.browse(cr, uid, ids, context=context):
             purchase_ids += [purchase.id for purchase in tender.purchase_ids]
-        if purchase_ids:
+        for purchase_id in purchase_ids:
             purchase_order_obj.action_cancel(cr, uid, purchase_ids)
-            purchase_order_obj.message_post(cr, uid, purchase_ids, body=_('Cancelled by the tender associated to this quotation.'), context=context)
+            purchase_order_obj.message_post(cr, uid, purchase_id, body=_('Cancelled by the tender associated to this quotation.'), context=context)
         return self.write(cr, uid, ids, {'state': 'cancel'})
 
     def tender_in_progress(self, cr, uid, ids, context=None):