Supplier RFQ to PO

Hello,
I'm on Epicor 905. I need to bring Supplier RFQ Number to PO Header Number01 field for enabling tracking the RFQ Number for a particular PO in Epicor. We create the PO from selecting the RFQ Lines from Supplier Response Screen by pressing the Create PO Button.
Anybody did a customisation in this area?
Thx
Sherin