Do not change objects in the SAP name range

What causes this issue?

All entries that are added, changed or deleted by the customer should
begin with the letter "Z". This ensures that such entries are not
overwritten by the SAP standard delivery during a release change.

How to fix this error?

Please only make entries that start with a "Z".
If you want to modify an existing entry, you must first copy it, and
then change the copy.

Error message extract from SAP system. Copyright SAP SE.