Solution : https://service.sap.com/sap/support/notes/153559 (SAP Service marketplace login required)
Key words :
incorrect settlement amounts occur, additional key words, attached advance corrections, billing category 'p', payment request created, payment amounts, billing category, billing rule, payment request, payment processing
Related Notes :
| 182417 | Incor. clearing of down payments from Release 3.x |
| 113347 | Down payment process. as of Release 4.0x (standard) |