Thanks shiva0, that's working well. Still I quite don't understand the behaviour as I don't have to update the instance when completing other activities. Can anyone give me a short explanation, please, I haven't seen anything like this in the docs so far and I would like to understand what I'm doing ;) Thanks. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4248513#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...