The Carrier Invoice Document type is not defined in the system

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Procedure for System Administrators

You must specify a carrier invoice type in Customizing for
Transportation Management under Settlement -> Freight Settlement ->
Define Carrier Invoice Types. You must specify a carrier invoice type
as the default type.

Error message extract from SAP system. Copyright SAP SE.