Issue with getting task:acquiredBy in a BPEL Composite.

Hi,
We are facing an issue with an XPath query:
<assign name="RescanHumanTask_1_readTask">
<copy>
<from variable="taskAssignedMessage"
part="payload"
query="/taskservice:taskAssignedMessage/task:task"/>
<to variable="RescanHumanTask_1_globalVariable"
part="payload"
query="/task:task"/>
</copy>
<copy>
<from variable="RescanHumanTask_1_globalVariable"
part="payload"
query="/task:task/task:systemAttributes/task:acquiredBy"/>
<to variable="inputVariable"
part="payload"
query="/client:process/client:invoice/contentType:assignee"/>
</copy>
</assign>
It gives us an error:
Error in evaluate <from> expression at line "427". The result is empty for the XPath expression : "/task:task/task:systemAttributes/task:acquiredBy".
Can someone figure out a way of getting the System Attribute task:acquiredBy inside a bpel flow.
Regards.
--Irshad.

acquiredBy will be empty unless it is acquired by any user. you should pick value from last updated by field.

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