Hi Ram,
As Susmitha suggested, use antoher work area and do process logic on second work area and let events on first workarea.
LOOP AT ITAB INTO WA1.
MOVE WA1 TO WA2.
AT FIRST WA1-FIELD.
<write logic on WA2 " as WA1 got reset.>
ENDAT.
ENDLOOP.
Regards,
Vijay