OK, when I try to code the proxy class, I had the entity model in mind. I.e., when tyring to do remote call, you should always detach from it entity manager first and then re-attach again later. I can see your use case here as well for user accidentally to pass in the reference (that's what I said of not transparent). And what you proposed make good sense. But on the same token, this can be user's expectation that serilization and POJO relationship are still intact on the remote node! Again, this is unintentional but they have no way of knowing it, unless of course we explictly throw an exception. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982860#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...