It is due to the merge node. They really aren't supported yet (both in the GPD or the database). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960716#3960716 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3960716