Solution : https://service.sap.com/sap/support/notes/1503601 (SAP Service marketplace login required)
Key words :
unicode interface software resides technically, ><functionname> encountered invalid utf-8, --- unicode interface [<filename> line <, unicode interface software, --- unicode interface ------ end, system time stamp, 80 additional bytes read, symptom error messages, environment variable nlsui_file_trace, unicode interface
Related Notes :
1375438 | Globalization Collection Note |
1319517 | Unicode Collection Note |