How to have PO's automatically close on 2 way match to PO not to receipt

We would like for our EXPENSE line type PO's to be a 2 way match to the PO not to the receipt.  Once the match is made and the invoice paid, we would like the PO to close.  Currently the PO will stay open until a receipt is made.  Is there a way to get around this without changing workflow to ALL PO's.  I have not found anywhere in the Purchasing Set up menu that will allow me to have expense lines close upon 2 way match.