Solution : https://service.sap.com/sap/support/notes/569156 (SAP Service marketplace login required)
Key words :
call method server->response->set_header_field, required character set conversions, current logon language exists, current system character set, relevant html form fields, content type= text/html, current logon language, current code page, server->response->set_data, native language support
Related Notes :
| 825036 | Corrupt characters in HTTP form fields |
| 743410 | Charset not transferred correctly after kernel patch |
| 652437 | Code page problems in the customer fact sheet |
| 614550 | Troubleshooting BC-I18 |