I tried but without success. I set the following code cascade = "all-delete-orphan" on-delete="cascade" inverse="true" on the "historyActivityInstances" set definition in the hbm.xml file in my jbpm.jar but it did not work. I don't undestand why. On the other side, I also don't understand how it can work with the actual code (but I'm not a jBPM expert and there is perhaps something I missed). Thanks for any clue. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4245629#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...