I had the same problematic. It's not a JBPM problem but a process state consistency. I presume that you're receiving msg form asynchronous systems via an MDB. In that case, you can change the PoolSize of that EJB to One, so that it will proceed messages one by one. Hope it will help View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4196880#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...