It looks to me like there ought to be a unique constraint across either the GROUP_ and ROLE_ columns or just the GROUP_ column within the identity JBPM_ID_MEMBERSHIP table. The effect would be to prevent a user from being in the same group more than one time, or barring that, require that each membership within the same group has a unique role. Agree/disagree? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4043667#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...