No carrier or driver available

What causes this issue?

A tour has not been assigned a forwarding agent or a driver. Settlement
is not possible.

System Response

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

How to fix this error?

Assign a forwarding agent or driver to the tour.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.