So, I have just tried repeating the issue and made the following steps:

1. Created a local company with one user, StandardID - a@a.a

2. Changed System>>Persons>>my user>>StandardID to b@b.b
3. Logged out and logged in with b@b.b - worked fine
4. Made TB
5. Restored to this TB
6. Logged in with b@b.b - worked fine
7. Tried to log in with a@a.a - could not do that - works fine.

Could you tell me if I made the same steps that should have allowed me to repeat the issue, or did I miss something?

P.S. tested in the same version, so we are most probably missing some piece of information in order to repeat this issue.

Looking forward to your answers.

Best regards,
HansaWorld team