Hi Everyone.We have a sp1 which is being called by User1. In this SP there are some tables that User1 does not have access to them, so I have to create another user2 and give proper permission to that user. when I ran the sp1 while I am login by User1 with 'execute as login = 'User2'',I recieved below error message:Cannot execute as the server principal because the principal "User2" does not exist, this type of principal cannot be impersonated, or you do not have permission. But if I ran the same statment while I login as sysadmin , I dont have any problem.I would appreciate if someone help me on this.Thanks
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