Okay, thank you, I fixed the problem by a nasty workaround, but I will take a look at it when I find some time and report if I succeeded. NASTY WORKAROUND: - create three SQL-tables nodex, nodey, nodez - change the foreignkey constraints to point to this tables - run seam-gen - change foreign keys to point to original intended table node - change annotated tablename to "node" in classes Nodex, Nodey, Nodez I know, that this isn't a good solution because the Cache is filled with three instances for every database-row, and you can get inconsistencies when editing the Nodexzy-classes, but I only use them for assigning the links between routings and nodes, so only the routings get changed. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126897#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...