Yeah, both "A" and "B" split. Then Join or Synchronization at "E" node is hard to implement. Because tokens from node "B" and "D" are not siblings. After ending the two entering tokens from "B" and "D", which token should be placed at node "E" and carries out the following execution. It seems that parent-child relationship between tokens is not enough to simulate partial order relationship between activities. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017687#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...