REPORT ZLEIY_ABAP_TEST.
DATA:BEGIN OF MAN,
NAME(30) TYPE C,
HIGN TYPE P DECIMALS 3,
WEIGHT TYPE P DECIMALS 2,
END OF MAN.
FIELD-SYMBOLS <FSA> LIKE MAN.
DATA MAN1 LIKE MAN.
MAN1-NAME = 'YaoMing'.
MAN1-HIGN ='2.25'.
MAN1-WEIGHT = 180.
ASSIGN MAN1 TO <FSA>.
WRITE: / <FSA>-NAME,
<FSA>-HIGN,
<FSA>-WEIGHT.
FIELD-SYMBOLS是字段符号，把结构定义分配给字段符号，通过字段符号来引用结构中的成员。
下面是keyword document的example:
Typing of a field symbol <itab> as an internal table and a field symbol <wa> with a complete generic type.
FIELD-SYMBOLS: <itab> TYPE ANY TABLE
<wa> TYPE any.
...
READ TABLE <itab>
WITH TABLE KEY ('...') = '...'
ASSIGNING <wa>.
