CUA central system &1 does not match the known CUA central system (&2)

What causes this issue?

The passed CUA central system (&V1&) does not match the last-known CUA
central system (&V2&) of the active CUA (&V3&).

System Response

The current CUA settings are not changed.

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?

If your CUA central system (&V1&) was created from a copy of the CUA
central system &V2&, check the copy of the RFC connections to the child
systems (in particular, the RFC connection with the name &V4&, to this
child system). These should no longer point to the child systems of the
original CUA central system, when you save the CUA landscape in the
copy.
If the local system (&V4&) is a copy of a CUA child system, start the
report RSDELCUA in the copied system, to delete the CUA data of the old
CUA before you add the copied system as a new child system to another
central system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.