Payment Process Request not follows FiFO Method while applying Credit Memo's against Invoice in PPR

Hi All,

Business had Several Credit Memo's in Payables & very few Standard invoices also available for the same supplier, when user submit payment process request, by enabling the Apply credits up to zero amount payment option, system not selecting the Oldest Credit Memo's to match off with standard invoices, instead selecting Very Latest Credit memo and matching with standard invoice. Please assist us how to instruct PPR to select oldest first (FIFO) since those were appearing in aging bucket which need to cleared first. The below parameters were matching with All Credit memo's.

• Supplier
• Supplier site
• Payment currency
• Payment method