System fields in ABAP programs can only overwritten in a few cases to control system behavior.
ABAP程序中的系统字段只在极少需要控制系统行为的时候才能被重写.
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The following table shows the system fields that can be used in ABAP programs.
下表列出了在ABAP程序中可以使用的系统字段.
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To determine type information of existing instances and type names of ABAP type system at runtime.
要在运行时通过已存在的实例与类型名来检测的类型信息.
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