cancelling manufacturing order in "waiting goods" state

[vrsb]

Hello. When I press Cancel button in the 'waiting materials' production order, I face the traceback.
File "/usr/lib/python2.6/site-packages/openerp-server/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/lib/python2.6/site-packages/openerp-server/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/usr/lib/python2.6/site-packages/openerp-server/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/openerp-server/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/lib/python2.6/site-packages/openerp-server/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
TypeError: action_cancel() takes exactly 4 arguments (5 given)