Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] replied 
to the discussion

"JBPM-2772 retrieve business key from sub-process"

To view the discussion, visit: http://community.jboss.org/message/557018#557018

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Correct, I mixed parent and super/subprocess usage in jBPM. Parent is used for 
executions that are derived from origin such as when using fork and super/sub 
are used to reflect relationship between processes. My mistake.

Back to the issue, I was suggesting to allow users to provide their business 
key for subprocess that will be used when executing it. Please consider very 
simple definition that consists of subprocess:

<process name="SubProcessDocument" xmlns="http://jbpm.org/4.4/jpdl";>

  <start g="20,20,48,48">
    <transition to="review" />
  </start>

  <sub-process name="review" key="#{mySubProcessBusinessKey}"
               sub-process-key="SubProcessReview"
               g="96,16,127,52">

    <parameter-in var="document" subvar="document" />
    <parameter-out var="reviewResult" subvar="result" />

    <transition to="wait" />
  </sub-process>

  <state name="wait" g="255,16,88,52"/>

</process>

Then when subprocess is created it will assign value of mySubProcessBusinessKey 
to key of the execution. Of course it can in some situations cause uniqueness 
problems but since it is designed to be externally provided (within scope of 
the process definition) I would say that it is a known risk.

Does it make sense to you or am I completely lost?

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