diff -r b747f2532e03 -r 6a02be304486 entities/sources.py
--- a/entities/sources.py	Thu Apr 25 17:30:09 2013 +0200
+++ b/entities/sources.py	Thu Apr 25 14:10:55 2013 +0200
@@ -27,7 +27,6 @@
 from logilab.common.configuration import OptionError
 from logilab.mtconverter import xml_escape
 
-from cubicweb import ValidationError
 from cubicweb.entities import AnyEntity, fetch_config
 
 class _CWSourceCfgMixIn(object):