The following throws an IllegalArgumentException because the location entity is not 'Managed': Snippet 1: | Location location = workgroup.getLocation(); | manager.refresh(location); //throws exception | manager.merge(workgroup); | My workarround is Snippet 2: | int location id = workgroup.getLocation().getId(); | Location location = manager.find(Location.class, id); | workgroup.setLocation(location); | manager.merge(workgroup); | What did I mis in Snippet 1 to be able to refresh? Appreciate your comments, Octavio View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4075501#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...