Why alter the foreign keys? Why not just set the JBPM_TOKEN.PROCESSINSTANCE to null on the token table, delete the process instances, and then the tokens. Also, you might want to look into the GraphSession. In 3.1.x, there is a GraphSession.deleteProcessInstance which will automatically go through and delete everything tied to that process instance, instead of you worrying about it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3959939#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...