Yes, both "orders" and "shipments" are of type List<>. Will adding @IndexColumn solve the problem? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3986949#3986949 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3986949