Mauricio Salatino [http://community.jboss.org/people/salaboy21] created the 
discussion

"Re: (User Tasks) How to get user tasks by process instance?"

To view the discussion, visit: http://community.jboss.org/message/620980#620980

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I know, that's the idea, but if you create a task list john will see all his 
tasks and he will be able to choose in which task to work. If you want to know 
from the history logs which process create each task you have the 
Task.TaskData.workItemId reference that helps you to find the process where 
that task instance was created. Notice that there is a named query defined for 
that reason:
 <named-query name="TaskByWorkItemId">
          <query>
select
    t
from
    Task t
where
    t.taskData.workItemId = :workItemId
          </query>
          <!-- hint name="org.hibernate.timeout" value="200"/ -->
      </named-query>

Cheers
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