Solution : https://service.sap.com/sap/support/notes/1090758 (SAP Service marketplace login required)
Key words :
user parameter ucp, user parameter ucp_fi, attached advance corrections, upload codepage rfebfi00, program rfebfi00, converted files, special characters, terms rfebka00, multicash reason, original file
Related Notes :
| 973902 | RFEBFI00: Dump CX_SY_CONVERSION_CODEPAGE |
| 758870 | Account statement: Character set when the file is uploaded |