You cannot modify central Basis objects

What causes this issue?

You want to use this transaction to edit objects that are assigned to
the central Basis component of your SAP System through their package.
Central Basis objects are just that, the basis of the SAP System. You
can damage the ability of the whole SAP System to function correctly if
you modify these objects. You could also lose these modifications when
you upgrade the system.

System Response

Warning

How to fix this error?

Do not modify central Basis objects. If you still believe you need to
modify these objects, then contact your SAP Basis Consultant.

Procedure for System Administrators

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.