How to raise a terminating event of a specific work item in a parallell workflow

[viveka.schwartz@implema.se]

Hello Workflowers,
 
I have defined a main workflow in system 1 with a parallell subworkflow in
it.   In the subflow definition I have defined a step based on a dialog
standardtask containing a Terminating event: obj.type ZTEST,  Event
APPROVED,  Element ZTEST.
 
When the workflow is triggered, (let's say) three parallell subflows are
started.  The dialog step in each subflow receives a unique work item ID.
 
>From a customer specific program in system 2 I would like to raise the
event ZTEST/APPROVED in system 1 for the dialog workitem in subflow 1 -
only.   Ie the other dialog workitems in subflow 2 and 3 should not be
affected by the event raised.
 
The specific workitemID in system 1 I would like to raise the event for is
known to the event caller; ie the customer specific program in system 2.
 
As far as I can see there is no possibility to define which specific
workitemID I would like to raise the event for in case the objectkey
itself does not consist of the work item ID. (The key of the ZTEST object
type is just a document number.)
 
Or is there a way to define the work item ID in the event call so that
only a specific workitem is affected ?
 
Best regards
Viveka