Table &: & of & entries in field & updated (cross-client)

What causes this issue?

Table &v1& is client-independent. The warning says these table entries
cannot be converted in the client copy - the old tables entries are
retained.

How to fix this error?

Depending on what the new client is used for, sometimes these table
entries need to be processed afterwards. You can manually add new
entries for the new logical system name.

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.