Delete Dataset File not working

Question

Hi All,
  I am trying to delete file from application server (AL11) directory after processing using DELETE DATASET FILE is not working , after processing also file still exists.
My code is like this,
*&      Form  backup_file
      The file has been processed.  Go ahead and copy it to the
      backup directory and delete it from the processing directory.
FORM backup_file .
  DATA: lv_oldfile TYPE string,
        lv_backup TYPE string,
        l_rc TYPE i.
  IF p_appl = 'X'.  "Unix file
    lv_oldfile = wa_files-filename.
  Replace the directory name with the backup directory.
    REPLACE p_dir IN wa_files-filename WITH p_back.
  Tack date/time onto the end of the file name to avoid duplicate
  files
    CONCATENATE wa_files-filename
                sy-datum
                sy-uzeit
              INTO wa_files-filename.
    OPEN DATASET wa_files-filename FOR OUTPUT
                                   IN TEXT MODE
                                   ENCODING DEFAULT.
    IF sy-subrc NE 0.
      f_backup_error = 'X'.
      EXIT.
    ELSE.
    Write the file contents to the new backup file.
      LOOP AT itab_input INTO wa_input.
        TRANSFER wa_input TO wa_files-filename.
      ENDLOOP.
    ENDIF.
  Close the backup file.
    CLOSE DATASET wa_files-filename.
  Delete the original file from the processing directory.
if sy-subrc = 0.
    DELETE DATASET lv_oldfile.
endif.
endform.
Thanks Everyone!

Answer 1

HI,
You have to check the value of Sy-subrc after the delete statement,
and the value present in the variable lv_oldfile that if there is correct
value in the variable populated or not.
Moreover after assigning the value to variable lv_oldfile in the step 
lv_oldfile = wa_files-filename.
then you should use this variable lv_oldfile only for open dataset and close dataset also.
Hope ir helps
Regards
Mansi