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How system get system field sy-uname ?

I check system parameter ID , found user name is put in XUS .

I use set parameter id command to change it , it can be changed.

But i run report , use debug mode , list sy-uname , it is still the login user account.

Could someone tell me how system get sy-uname ? Does it get from system parameter id ? If yes , which parameter id keeps it ?


It is not getting from any system id parameters. You cannot and should not change any sy field contents.

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