Solution : https://service.sap.com/sap/support/notes/148757 (SAP Service marketplace login required)
Key words :
additional key words budat, report rfbnum00 displays gaps, start report rfbnum00, report delivers, incorrect gaps, posting date, reference numbers, general selections, document numbers, documents exist
Related Notes :
175047 | Causes for FI document number gaps (RF_BELEG) |
115222 | RFBNUM00 does not select clearing documents |
44978 | Problems with RFBNUM00 |