diff --git a/addons/purchase_requisition/purchase_requisition.py b/addons/purchase_requisition/purchase_requisition.py
index f773bbd8505..79b8cce4bd5 100644
--- a/addons/purchase_requisition/purchase_requisition.py
+++ b/addons/purchase_requisition/purchase_requisition.py
@@ -22,7 +22,6 @@
 from datetime import datetime
 from dateutil.relativedelta import relativedelta
 import time
-from openerp import netsvc
 
 from openerp.osv import fields,osv
 from openerp.tools.translate import _
@@ -211,8 +210,7 @@ class purchase_order(osv.osv):
                         proc_ids = proc_obj.search(cr, uid, [('purchase_id', '=', order.id)])
                         if proc_ids and po.state=='confirmed':
                             proc_obj.write(cr, uid, proc_ids, {'purchase_id': po.id})
-                        wf_service = netsvc.LocalService("workflow")
-                        wf_service.trg_validate(uid, 'purchase.order', order.id, 'purchase_cancel', cr)
+                        self.signal_purchase_cancel(cr, uid, [order.id])
                     po.requisition_id.tender_done(context=context)
         return res
 
diff --git a/addons/purchase_requisition/test/purchase_requisition.yml b/addons/purchase_requisition/test/purchase_requisition.yml
index 38e66788dcf..f23737d21b8 100644
--- a/addons/purchase_requisition/test/purchase_requisition.yml
+++ b/addons/purchase_requisition/test/purchase_requisition.yml
@@ -69,10 +69,8 @@
   I confirmed RFQ which has best price.
 -
   !python {model: purchase.order}: |
-    import netsvc
-    wf_service = netsvc.LocalService("workflow")
     purchase = self.browse(cr, uid, ref('rfq2'), context=context)
-    wf_service.trg_validate(uid, 'purchase.order', purchase.id, 'purchase_confirm', cr)
+    self.signal_purchase_confirm(cr, uid, [purchase.id])
 
 -
   I check status of requisition after confirmed best RFQ.