Unicode type not convertible

Question

Hi,
Need some help in modifying the code ... I am working on a mass download of data into a texr file from the tables. Few of these tables have fields in decimal or currency and I  need to read them into character string. I know the structure of the internal table I read the data into has to exactly match the table structure in Unicode environment. How to add that in the code when I am pulling the tables dynamically and reading their data in a sequential  manner. Hence I am getting the above error.
Data: begin of i_list occurs 0,
      i_tabledata(2550) type c,
     end of i_list.
select * from (v_tabname) into i_list.   -
> Unicode  type not convertible error...
        append i_list.
        clear i_list.
      endselect.
The value of 'v_tabname' comes from the table DD02l dynamically.
Any thoughts?
Thanks,
VG

Answer 1

As per your requirement, i developed this code snippet.
I download the data from ZTESTVBAK & upload the data to YTESTVBAK. Not sure why you're transferring the data to string & trying to read the string ?
Check this code snippet:
PARAMETERS: p_tab TYPE tabname OBLIGATORY DEFAULT 'ZTESTVBAK',
            p_dwld RADIOBUTTON GROUP grp1 DEFAULT 'X',
            p_upld RADIOBUTTON GROUP grp1.
DATA: dref TYPE REF TO data,
      v_tab TYPE tabname,
      lcx_sql_err TYPE REF TO cx_sy_sql_error,
      v_errtxt TYPE string.
FIELD-SYMBOLS: <itab> TYPE STANDARD TABLE,
               <wa> TYPE ANY.
CREATE DATA dref TYPE STANDARD TABLE OF (p_tab).
ASSIGN dref->* TO <itab>.
IF p_dwld = 'X'.
  SELECT * FROM (p_tab) INTO TABLE <itab> UP TO 100 ROWS.
  IF sy-subrc = 0.
    CALL FUNCTION 'GUI_DOWNLOAD'
      EXPORTING
        filename                = 'C:\dyntab.txt'
        write_field_separator   = 'X'
        confirm_overwrite       = 'X'
      TABLES
        data_tab                = <itab>
      EXCEPTIONS
        file_write_error        = 1
        no_batch                = 2
        gui_refuse_filetransfer = 3
        invalid_type            = 4
        no_authority            = 5
        unknown_error           = 6
        header_not_allowed      = 7
        separator_not_allowed   = 8
        filesize_not_allowed    = 9
        header_too_long         = 10
        dp_error_create         = 11
        dp_error_send           = 12
        dp_error_write          = 13
        unknown_dp_error        = 14
        access_denied           = 15
        dp_out_of_memory        = 16
        disk_full               = 17
        dp_timeout              = 18
        file_not_found          = 19
        dataprovider_exception  = 20
        control_flush_error     = 21
        OTHERS                  = 22.
    IF sy-subrc = 0.
      WRITE: / 'File download successful.'.
    ENDIF.
  ENDIF.
ELSEIF p_upld = 'X'.
  CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      filename                = 'C:\dyntab.txt'
      has_field_separator     = 'X'
    TABLES
      data_tab                = <itab>
    EXCEPTIONS
      file_open_error         = 1
      file_read_error         = 2
      no_batch                = 3
      gui_refuse_filetransfer = 4
      invalid_type            = 5
      no_authority            = 6
      unknown_error           = 7
      bad_data_format         = 8
      header_not_allowed      = 9
      separator_not_allowed   = 10
      header_too_long         = 11
      unknown_dp_error        = 12
      access_denied           = 13
      dp_out_of_memory        = 14
      disk_full               = 15
      dp_timeout              = 16
      OTHERS                  = 17.
  IF sy-subrc = 0.
    v_tab = p_tab.
*   Lock the table records
    CALL FUNCTION 'ENQUEUE_E_TABLEE'
      EXPORTING
        tabname        = v_tab
      EXCEPTIONS
        foreign_lock   = 1
        system_failure = 2
        OTHERS         = 3.
    IF sy-subrc = 0.
      TRY .
          MODIFY (p_tab) FROM TABLE <itab>.
        CATCH cx_sy_sql_error INTO lcx_sql_err.
          v_errtxt = lcx_sql_err->get_text( ).
      ENDTRY.
    ENDIF.
*   Unlock the table records
    CALL FUNCTION 'DEQUEUE_E_TABLE'
      EXPORTING
        tabname = v_tab.
    COMMIT WORK.
  ENDIF.
ENDIF.
Hope this helps.
BR,
Suhas