FIELD-SYMBOLS:
    <fs_from_pc> TYPE char1,
    <fs_file> TYPE rlgrap-filename.

* Useing dynamic assign to obtain global data of calling report
  ASSIGN ('(RFEKA400)UPLOAD') TO <fs_from_pc>.
  IF sy-subrc = 0.
*   If source file if on user PC - upload it another time
*   with translating from DOS code page
    IF <fs_from_pc> = 'X'.
      ASSIGN ('(RFEKA400)AUSZUG-FILE') TO <fs_file>.
      IF sy-subrc = 0.
        REFRESH t_raw_data.
        CALL METHOD zcl_char_utils=>upload_dos_file
          EXPORTING
            im_filename   = <fs_file>
          CHANGING
            ch_data_tab   = t_raw_data[].
      ENDIF.
    ENDIF.
  ENDIF.