RTV Debit Memos are not getting generated

Hi

RTV debit memos are not getting created in AP and RCV_TRANSACTIONS has invoice_status_code as Pending?

I have checked below conditions and all are ok.

1. 1.The supplier site has to be marked to allow RTS transactions.
   2. There must be an original invoice already in AP for the item being returned.
   3. The PO and the original Invoice must be to the same Supplier Site.
   4. The Supplier Site must be marked as BOTH a Pay Site and a Purchasing Site.
   5. The return quantity cannot cause the quantity invoiced to go negative and the return quantity must be equal to or less than the quantity invoiced.