REPORT  Z07_020.
DATA: BEGIN OF line,
                col1 TYPE I,
                col2 TYPE I,
        END OF line.

DATA itab LIKE TABLE OF line.

DO 2 TIMES.
        line-col1 = sy-Index.
        line-col2 = sy-Index ** 2.
        APPEND Line TO itab.
ENDDO.

line-col1 = 11. line-col2 = 22.
INSERT line INTO itab Index 2.

INSERT INITIAL Line INTO itab INDEX 1.

LOOP AT itab INTO Line.
        WRITE: / sy-tabix, '라인 : ', line-col1, line-col2.
ENDLOOP.