Error during processing Attribute/Type &

What causes this issue?

After editing the selected attribute/type in the provided editor window
an error occurred. It is not allowed to change or delete the name of the
attribute/type.
You can only process the selected attribute/type and you are also not
allowed to enter more than one attribute/type in the editor window.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.