今天看到一篇Jerry Wang 2016年写的关于设置 conditional break point的文章，正好解决我多年如何设置根据fs值进行调试，因为watch point是不能对fs进行处理。非常感谢，也非常开心！

Source code breakpoint in ABAP debugger
Create a new breakpoint in debugger dynamically:

Maintain your condition as below:

And then you should see this new conditional break point set in line 15:

Then F8 to continue, the break point is triggered only once when = 22.