This exception can also occur when you are performing multiple fetch joins (on bags) in a query Cheers, Andrew View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4052705#4052705 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4052705