Hi Srikant,
Modify your internal table. and its better to use work area if possible.
Sample code to modify
MODIFY ITRGPDET
FROM WARGPDET
INDEX RGPTBL1021-CURRENT_LINE.
IF SY-SUBRC <> 0.
APPEND ITRGPDET.
ENDIF.
Here ITRGPDET is internal table and WARGPDET is work area.
Thanks,
Ranjit K.