Upload of value mapping fields not allowed

What causes this issue?

You cannot upload value mapping fields.

System Response

The system did not upload the value mapping fields.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

You can create the value mapping fields manually. For entries in
customer namespace, ensure that the values are mapped during inbound and
outbound processing.
For more information, see Customizing for <ZK>Value Mapping</> under
<ZK>Overall Information</>.

Error message extract from SAP system. Copyright SAP SE.