How Confirm Receipts ESS job is creating receipts in Oracle Fusion

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How Confirm Receipts ESS job is creating receipts in Oracle Fusion

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Hi Team,

We have some PO receipts to be returned. When we check under requester user we are not able to find them. We checked in rsh_shipment_headers the created by for receipt is conversionuser under which we have 'Confirm Receipts' scheduled. We can see request_id of ESS job on this receipt table.
Since the created by is not requester , requester is not able to return the PO receipts. Can you please explain me why the receipts were created under conversionuser and what is functionality of 'Confirm Receipts' ESS job.