Solution : https://service.sap.com/sap/support/notes/589577 (SAP Service marketplace login required)
Key words :
\gui_down' filetype = 'bin' bin_filesize = size importing filelength = datalen1 tables data_tab = itab exceptions file_open_error = 1 file_write_error = 2, terms ws_download ws_upload gui code page substitution character reason, prerequisites abap application generates text data, call function 'ws_download' exporting filename = ', application server code page, fe code page correctly, expects binary transparent download, itab type table, datalen1 type, = 'äöüäöüß weiterer text'
Related Notes :
| 195490 | Automatic selection of GUI frontend code page |