0 stands for success
4 stands for failure, that is no key found
8 stands for failure but it means no further keys available…
0 代表成功.
4 代表失败，没有找到钥匙.
8.代表失败，没有期进一步的键可以用
sy-subrc 值 0 ,4 和 8
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转载自blog.csdn.net/beyond911/article/details/114289648
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