http://community.jboss.org/servlet/JiveServlet/downloadImage/38-3624-11442/450-270/ScreenHunter_01+Feb.+21+22.18.gif
Did you specify the variables in the bpmn for the process scope as shown above?
(as shown in http://community.jboss.org/people/bpmn2user/blog/2011/02/21/jbpm5-example-for-forms-with-variables)
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