if you want compound foreign keys, you've got to work them for yourselves. since compound foreign keys are against normalization, i think we won't see this too soon entering any ejb-spec. the error is actually quite precise in that 'Both roles of a relation-table mapped relationship must have key fields' = <prim-key-field> instead of only <prim-key-class> i'd always use ids for any table, but this is just my opinion. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4025846#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...