REPORT  Z07_024.
DATA: BEGIN OF line,
                col1(2) TYPE c,
                col2 TYPE i,
                col3 TYPE sy-datum,
        END OF line.

DATA itab LIKE HASHED TABLE OF line WITH UNIQUE KEY col1.

line-col1 = 'AA'.
line-col2 = 50.
line-col3 = '2007-10-19'.
INSERT line INTO TABLE itab.


line-col1 = 'AA'.
line-col2 = 100.
line-col3 = sy-datum.

MODIFY TABLE itab FROM line.

LOOP AT itab INTO line.
        WRITE: / line-col1, line-col2, line-col3.
ENDLOOP.