--- a/iro/offer/provider.py	Sun Mar 25 20:14:35 2012 +0200
+++ b/iro/offer/provider.py	Sun Mar 25 20:17:23 2012 +0200
@@ -85,7 +85,7 @@
     :raises: :exc:`~iro.error.ValidateException`
     '''
     if typ not in providers.keys():
-        raise ValidateException()
+        raise ValidateException(field=field)
     return typ
 
 providers={}