Voucher Source

CUST Custom Custom Interfaces (INF02 and OSS VOLT).
EDI EDI EDI - Electronic Data Interchange (EDI) is a method in which suppliers transmit invoice information electronically.

ONL

Online Online - Manually entered vouchers.
PROC ProCard Procurement Cards - Recycled vouchers are vouchers created through an automated process that have missing information are put in recycled status (ISTV, interface, EDI).
SSI Self-Service Invoices

Self Serve - These are eSettlements Invoices.