Why do not simply add a compatibility flag for the new process description (or for any node of the process descritpion) which could state the compatibility of the new process definition version with older process instances. When an instance token is signalled, instead of moving blindly in the path, it could check if next version is backward compatible. Also a node old-to-new mapping kind of descriptor shoud be added, or asked to be resolved at deployment. This way: 1) I am a process in a node - token - so when i need to move i check if newer process definitions exist and if they are compatible. 2) If it exists, i lookup in the node old-to-new mapping to check the node compatibility and lookup for transitions (and tasks, and actions, and so on...) Just (a silly?) idea. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4054382#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...