No separate document type exists for invoice reduction

What causes this issue?

You want to post an invoice that has been reduced. This results in two
FI documents being created. You require different document types to
process both FI documents correctly.

System Response

The invoice cannot be posted.

How to fix this error?

Your system administrator must enter a separate document type for
invoice reduction with transaction &V1& in Customizing for Logistics
Invoice Verification.

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.