User SAP* deleted

What causes this issue?

User or authorization copy error. The user SAP* has been deleted to
permit a logon to the client with the initial user SAP*.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Remove the cause of the error. Then complete the client copy with
RESTART or the function 'Recopy Error', depending on the copy status.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.