Invoice Received Date

Hi,

How i can set the invoice received date defaultation to AP incase of PO Matched  and Pay on receipt invoice process. Manullay invoice, the user can enter the date invoice received in payable workbench,but for automatic process, how we can get the defaulted  invoice received date from appropriate purchase order using pay on receipt process (ERS invoices)

Thanks in advance, We are in R12.1.1