No new owners are selected to Combine - function is not valid.

What causes this issue?

It is only valid to process the Combine function if new owners are
selected to combine, but no new owners have been selected.

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?

If you would like to check the combinability of the new owners please
set the 'Combine Flag' checkbox on the New Owners tab to 'X' and repeat
the process.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.