How does a voucher get a Voucher Type of 'B' (Batch Edit Vouchers) and Oprid of '0' (Zero)?

We found some vouchers were created with an Oprid of '0' (zero) and Voucher Type of 'B' (Batch Edit Vouchers). We are trying to find out how the vouchers were created this way. We assume they were interfaced in possibly using the delivered voucher upload spreadsheet since the Voucher Source is "XML Invoice". Why would a Voucher Type of B (Batch Edit Voucher) be used instead of R (Regular Voucher) when the voucher is built, and populate the Oprid with '0' (zero) instead of the user id of who ran the voucher build process?

We are on 9.2 Image 33, PeopleTools 8.57.