The process definition part which causing the problem is: | <task-node name="SomeTask"> | ...... | <transition to="Decide"></transition> | </task-node> | | <decision name="Decite"> | ..... | </decision> | I've tested the following cases: | <task-node name="SomeTask"> | ...... | <transition to="SomeTask2"></transition> | </task-node> | | | <task-node name="SomeTask2"> | ...... | <transition to="Decide"></transition> | </task-node> | | <decision name="Decite"> | ..... | </decision> | | <task-node name="SomeTask"> | ...... | <transition to="SomeState"></transition> | </task-node> | | | <state name="SomeState"> | ...... | <transition to="Decide"></transition> | </state> | | <decision name="Decite"> | ..... | </decision> | | <task-node name="SomeTask"> | ...... | <transition to="SomeNode"></transition> | </task-node> | | | <node name="SomeNode"> | ...... | <transition to="Decide"></transition> | </Node> | | <decision name="Decite"> | ..... | </decision> | In all cases the process successfully goes to the node after my task-node but when tries to continue to the decision node this exception comes. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4242964#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...