You only need:
et var [$$RQ; value:tblReq::__pkReqIndex]
Go to Layout ["NoteReq" (tblReq)]
Set Field [NoteReq::_fkReqIndex; $$RQ]
tblReq::__pkReqIndex = NoteReq::_fkReqIndex
is all that you need.
On a layout based on NoteReq, you can just add the RequestNo and PO fields from tbleReq to your layout and they will display that data from the related record in tblReq.