Undesired default attached files found when create receive in iProcurement

When create receive in iProcurement, there are some attached files defaulted to screen. The files are not belong to requestor and no relation to requisition or purchase order or supplier.

The files come to screen repeatly until someone has delete them. My investigation found the original document id come from entity name as RCV_HDRS_TEMP and PK1_VALUE is -1.

This is happened quite often.

I'd like to understand when we check data from FND_ATTACHED_DOCUMENTS, what is the document_id that entity_name = 'RCV_HDRS_TEMP' and PK1_VALUE = 1.