Flight is not archivable, because not all flight bookings have invoices.

What causes this issue?

The flight cannot be archived. Invoices have not been created for all of
its flight bookings (for example flight booking &V1&).

System Response

How to fix this error?

The business process has not been completed. The flight can only be
archived once invoices have been created for all of its bookings.
Contact the person responsible for this flight.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.