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convert StartEvent form property as businessKey

Question asked by gibsosmat on Feb 27, 2012
Latest reply on Jul 24, 2013 by jbarrez
I have a start event of a process defined as:
<startEvent id="startevent" name="Start">
        <activiti:formProperty id="OrderId" name="OrderId" type="string" required="true" readable="true" writable="true"></activiti:formProperty>

I am deploying this in activiti-explorer, whenever someone creates a new instance of this process, they need to specify OrderId.
This is working fine, but I want this value to be set as BUSINESS_KEY_ in process instance (it will also go into ACT_RU_EXECUTION, ACT_HI_PROCINST)

I didnt find much documentation on explorer regarding this,
any suggestions, how to do it?