ABAP内表使用错误，教材的问题

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"ITAB" 和 "LINE" 的行不能相互转换。在 Unicode 程序中，"ITAB" 与 "LINE"的结构布局必须相同，与Unicode 字符的长度无关。must have the same structure layout as"LINE", irrespective of the length of a Unicode character. Unicodecharacter.

DATA: BEGIN OF line, " work area
        num TYPE I,
        sqr TYPE I,
      END OF line,
      "internal table
      itab TYPE STANDARD TABLE
        OF line  WITH KEY TABLE_LINE.
DO 5 TIMES.
  line-num = sy-index.
  line-sqr = sy-index ** 2.
  APPEND line TO itab.
ENDDO.
LOOP AT itab INTO line.
  WRITE: / line-num, line-sqr.
ENDLOOP.
CLEAR itab.

更正后：

types: BEGIN OF lineX,
        num TYPE I,
        sqr TYPE I,
      END OF lineX.
DATA: itab2 TYPE STANDARD TABLE OF lineX,
      wa_itab2 LIKE LINE OF itab2.
DO 5 TIMES.
  wa_itab2-num = sy-index.
  wa_itab2-sqr = sy-index ** 2.
  APPEND wa_itab2 TO itab2.
ENDDO.
LOOP AT itab2 INTO wa_itab2.
  WRITE: / wa_itab2-num, wa_itab2-sqr.
ENDLOOP.
CLEAR itab2.

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