The logical system name & has been used by client &

What causes this issue?

The logical system name is the enterprise-wide unique name for a client
in this database. The logical system name &v1& has already been used by
client &v2&.

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?

Select a logical system name that has not yet been used in your system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.