REPORT  Z07_023   .
DATA: BEGIN OF line,
                col1(3) TYPE c,
                col2(2) TYPE n,
                col3    TYPE i,
        END OF line.

DATA itab LIKE SORTED TABLE OF line
                WITH NON-UNIQUE KEY col1 col2.

line-col1 = 'AA'. line-col2 = '17'. line-col3 = 660.
COLLECT line INTO itab.

line-col1 = 'AL'. line-col2 = '34'. line-col3 = 220.
COLLECT line INTO itab.

line-col1 = 'AA'. line-col2 = '17'. line-col3 = 280.
COLLECT line INTO itab.

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