Personalization to default Position hierarchy on Approval form does not work.

Team,

I am trying to personalize the approval form for Standard purchase order to default position hierarchy depending upon inventory or expense items but failing.

condition:

WHEN-NEW-ITEM-INSTANCE

PO_APPROVE

Action

ITEM

PO_APPROVE.APPROVAL_PATH

VALUE

XXX

I have defaulted the forward from and forward to. but the position hierarchy value populates but is not forwarded to the next.