swatis is right, and you can always cancel parallel task with actionhandlers.
Look at
http://planetjbpm.wordpress.com/2008/10/01/implementing-milestones-in-jbpm/ for
examples
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I guess verify task is colloborative task. In jbpm i don't know whether we can
define colloborative task. But you need to modify your workflow such way that
you can still achieve the same functionality.
Use Fork and join for your "verify task" create two similar structured tasks
and assign to tw