Solution : https://service.sap.com/sap/support/notes/335893 (SAP Service marketplace login required)
Key words :
additional key words sapf110s, attached source code corrections, specification bkpf-tcode = 'f110', bkpf-xblnr, pay manually, reference field, system issue, document number, payment document, similar function
Related Notes :
| 213551 | F110: Reference document not transferred |