Need guidance on AP workflow setup

The default voucher approval workflow functionality selects the Approval Rule Set from the voucher origin, the AP BU, or the Vendor.  And the Route Control Profile uses the USERID of the person creating the voucher to route the voucher for approval.  In our scenario,  we use the voucher Origin tied to the  USERID of the person creating the voucher to drive the workflow approval for non-PO vouchers. 

 

In the case of PO matched vouchers, the available functionality is not going to work for us, as we want PO vouchers to be routed for approval to different RCP and potentially different ARS based on the PO BU and the requestor, not the person that created the voucher.  Note that a single person from AP will be creating PO vouchers for multiple departments/requisition preparers.