You can generate a CSV file template for key mapping entities only.

What causes this issue?

You are attempting to generate a template for value mapping functions or
codes, such as company code, business area or country code.

System Response

This is <ZH>not</> supported with the <LS>Central Finance</> mapping
tool.

How to fix this error?

Select only key mapping entities, such as customer ID or G/L account for
generating a CSV file template.
You can still display or download mappings for value mapping entities.

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.