Common attr. &1 is equivalent to common attr. &2 in another system/client

What causes this issue?

A common attribute has an internal key (which is a GUID) and an external
key (its name you can see in the Enterprise Search Modeler), When you
create a new common attribute or rename an existing common attribute the
combination of the internal and the external key is stored on the
GTABKEY-server to assure that an common attribute has the same internal
key in different systems.
During the creation of common attribute &v1& it was detected that there
is already an according entry on the GTABKEY-server with the same
internal key and the external key &v2&.
This means either that
a common attribute with the name &v2& exists in at least one other
system/client (e.g. in a lower release) or
that in this or in another system/client a common attribute with the
name &v2& had existed and was deleted.
Common attribute &v2& has been renamed from common attribute &v1& but is
semantically the same.

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?

Please be aware that in case 1. the new common attribute &v1& is the
same as the other common attributes named &v2& that exist in other
systems/clients.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.