Group ID &1 has already been assigned; make a new entry

What causes this issue?

Identification &V1& already exists.

System Response

Identification &V1& is already assigned to a supersession chain or an
FFF-class.

How to fix this error?

Check, and if necessary correct, your entry.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.