REPORT  Z07_014  .
DATA: BEGIN OF line,
                col1(1) Type c,
                col2(1) Type c,
        END OF line.

DATA itab LIKE TABLE OF line.

line-col1 = 'A'. line-col2 = 'B'.

APPEND Line TO itab.

REFRESH itab.
* FREE itab.
* CLEAR itab.

IF itab IS INITIAL.
        WRITE '인터널 테이블에 데이터가 존재하지 않습니다.'.
        FREE itab.
ENDIF.