Configuration of Mapping of fields when using Create Report from Trip

Summary:

Hello, I have read all the documentation and successfully have setup and imported Trip Itineraries from a third party. However, when I use the "Create Report from Trip" option, there are fields which are required on the Expense that I can't populate from my Trip (see below). From what I can tell, these fields are not available in the Travel Itinerary API, but some are available for defaulting through the Trip Validation (like Fare Class). Is there any other way to populate or default these fields?

Thanks!

Lee