Solution : https://service.sap.com/sap/support/notes/184593 (SAP Service marketplace login required)
Key words :
directory~ftp/general/frontend/sapgui/extended_help/windows/plainhtml/, directory<docupath>\helpdata\<language_id>\, additional key words plainhtmlfile, ftp server sapservx, required css directory, css directory, online documentation, error message, web informing, message requires
Related Notes :
| 101481 | Collective note: Application help and R/3 library |