WF-PR Triggered from MRP

[Maorriyan]

Good day all,
I'm in 4.6C.
I have 2 workflow for PR that I modified from SAP, workflow for
requisition release (WS00000038) and workflow for overall release of
requisition (WS20000077). Both my workflow is running properly if it's
trigger from normal PR creation. But when this PR is created from MRP
process, my workflow is not triggered. As all you know that PR can be
created from reservation (PM) and from MRP (MM). I have tested manually
from SWUS, the workflow is triggered.
Any clue/ solution form my problem ?
=20
Thanks in advance,
=20
Maorriyan