SAP-ABAP-快速定义一个结构，包含另一个结构

"1
TYPES : BEGIN OF TY_MARA ,
    ICON TYPE C LENGTH 4  ,
    MESG TYPE C LENGTH 40 .
  INCLUDE TYPE    MARA  .
 TYPES END OF TY_MARA .
DATA GT_MARA TYPE TABLE OF TY_MARA .

"2
TYPES : BEGIN OF TY_MARC ,
    ICON TYPE C LENGTH 4  ,
    MESG TYPE C LENGTH 40 .
    INCLUDE structure     MARC  .
 TYPES END OF TY_MARC .
DATA GT_MARC TYPE TABLE OF TY_MARC .