Apart fropm many things that went worng with your ERM you have two @Ids on rutapuerto. Regards Felix View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042901#4042901 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4042901