Solution : https://service.sap.com/sap/support/notes/117238 (SAP Service marketplace login required)
Key words :
'customer purchase order numer' field, additional key words lv60af0g, order-related billing, 'reference number' field, general billing interface, transaction ta -> fx, gn_invoice_createreference number, vbrk-bstnk_vf, program error, advance correction
Related Notes :
| 67481 | General billing document interface - collective note |