You have to remove the EcheancePret from the EcheancePrets collection in Pret before you can delete it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080648#4080648 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4080648