Problem in modifying the existing record in table control

Hi Experts,
I have one table control.I have entered one record and save it.When I am modifying the same record a duplicate record is created.I need if I modify the same record that record should only modify.How to delete the duplicate record.

Hi,
In Flow logic.
LOOP .
MODULE tbc_modify ON CHAIN-REQUEST.
MODULE tbc_mark.
ENDLOOP.
In module.
MODULE tbc_modify INPUT.
MODIFY t_data
    FROM fs_data
   INDEX tbc-current_line.
IF sy-subrc NE 0.
    APPEND fs_data TO t_data.
ENDIF.
ENDMODULE.
MODULE tbc_mark INPUT.
DATA: tbc_wa2 LIKE LINE OF t_data.
IF tbc-line_sel_mode = 1
AND fs_data-mark = 'X'.
    LOOP AT t_data INTO tbc_wa2
     WHERE mark = 'X'.
      tbc_wa2-mark = ''.
      MODIFY t_data
        FROM tbc_wa2
        TRANSPORTING mark.
    ENDLOOP.                          .
ENDIF.
MODIFY t_data FROM fs_data
    INDEX tbc-current_line
    TRANSPORTING mark.
ENDMODULE.
Edited by: sapabap403 on Aug 31, 2011 9:29 AM

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Problem in modifying the existing record in table control

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