@rocade Maybe it is better to realise this *outside* jBPM. It is good practice to store a little info as needed in the engine. Have a domain model outside jBPM and relate the data of a belonging to a processinstance to the processinstance by using the (business)key. This is a field on the processinstance. That way, you can do locking or detecting changes (hibernate versioning!!) outside jBPM. I think that would be a better solution View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4163796#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...