diff --git a/addons/mrp_operations/mrp_operations.py b/addons/mrp_operations/mrp_operations.py
index df5456baa4a..668b69c6fcc 100644
--- a/addons/mrp_operations/mrp_operations.py
+++ b/addons/mrp_operations/mrp_operations.py
@@ -244,15 +244,17 @@ class mrp_production(osv.osv):
             wf_service.trg_validate(uid, 'mrp.production.workcenter.line', workcenter_line.id, 'button_start_working', cr)
         return super(mrp_production,self).action_in_production(cr, uid, ids)
     
-    def action_cancel(self, cr, uid, ids):
+    def action_cancel(self, cr, uid, ids,context=None):
         """ Cancels work order if production order is canceled.
         @return: Super method
         """
-        obj = self.browse(cr, uid, ids)[0]
+        if context is None:
+            context = {}
+        obj = self.browse(cr, uid, ids,context)[0]
         wf_service = netsvc.LocalService("workflow")
         for workcenter_line in obj.workcenter_lines:
             wf_service.trg_validate(uid, 'mrp.production.workcenter.line', workcenter_line.id, 'button_cancel', cr)
-        return super(mrp_production,self).action_cancel(cr,uid,ids)
+        return super(mrp_production,self).action_cancel(cr,uid,ids,context)
 
     def _compute_planned_workcenter(self, cr, uid, ids, context=None, mini=False):
         """ Computes planned and finished dates for work order.