Well there *is* a reason. If you have e.g. this expression : previous --> 
group(jbpm-users) --> member(expert) --> group(hierachy) --> member(boss) then 
you will have a problem resolving the fourth and fifth expression if there is 
more than one expert jbpm-user.
Anyway, providing your own AssignmentHandler is not that difficult. The 
hardcoded relationship in JpdlParser is not important. You simply implement an 
AssignmentHandler e.g. by inheriting from ExpressionAssignmentHandler and 
define one 'expression' field in this class. You then should use the 'handler' 
configuration option in the task (instead of 'expression') and configure the 
expression string though the field configuration mechanism.

Regards,
Koen

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