REPORT  Z07_018    .
DATA: BEGIN OF line,
                col1 TYPE I,
                col2 TYPE I,
        END OF line.

DATA itab LIKE HASHED TABLE OF line WITH UNIQUE KEY col1
                                        INITIAL SIZE 10.
DATA: lin    TYPE I,
        ini    TYPE I,
        knd(1) Type c.

DESCRIBE TABLE itab Lines lin OCCURS ini KIND knd.
WRITE: / lin, ini, knd.

DO 1000 TIMES.
        line-col1 = sy-Index.
        line-col2 = sy-Index ** 2.
        INSERT line INTO TABLE itab.
ENDDO.

DESCRIBE Table itab Lines lin OCCURS ini KIND knd.
WRITE: / lin, ini, knd.