eSupplier invoices are being created and the origin of each invoice should be ESL and not ONL

For our eSupplier invoices that are being created, once they are run through the voucher build process they end up in AP's regular entry page and they have an origin of ONL and not the intended ESL (eSettlement Vouchers)

After the invoice has been created through the eSupplier Portal, the invoice is approved for processing via the eSettlements > Self-Service invoice > Review Invoice

The invoice is then processed through the Voucher build (Accounts payable > Batch Process > vouchers > voucher build) successfully but when opening the voucher within the Regular Entry screen (Accounts Payable > Vouchers > add/update > Regular Entry) the origin shows up as ONL(ON-Line), when it should be ESL(eSettlement Vouchers).