You are not authorized to use value assignment type &1

What causes this issue?

You are not authorized to change the value assignment type. According to
your authorization profile, you are not allowed to create or change the
value assignment type.

System Response

The value assignment type cannot be created or changed.

How to fix this error?

If you need authorization to create or change the value assignment type,
contact your system administrator.

Procedure for System Administrators

Check the user's authorizations.

Error message extract from SAP system. Copyright SAP SE.