How to override the Payer address in the Payment Instruction XML output?

Hi,

The "Payer" tags in the Payment Instruction XML output by default shows the Legal Entity name and its address and other relevant information.

This Legal Entity address is what's being passed to the bank and is printed by the bank as return address in the checks they issued.

But we have a need to show the Operating Unit's address instead in the XML output so that the bank prints it as the return address.

Is there a way we can make the Payment Instructions XML output show the Operating Unit's address in the "Payer" tag instead of the Legal Entity?  Please advise.