Hi Ed Staub, first of all many thanks for your response. I know its complex to solve this problem. But i don't want to do that in the processDefinition, because who knows when this kind of mistake means (in which activity or task-node- which actor)occure. You know what i mean. Suppose you have many users say the first task-node with task for actor(ernie) has no misteke continue to the second task-node with task for actor(bert) has also no misteke so continue to the third task-node with task for(grover) he made a misteke means(his variable was not correct) i want immediately block this task and continue it letter. So i can't say when the mistake happens. I hope you understand what i want to do:) So if you have any idea to solve this problem i would be grateful for your information. cheers View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046911#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...