Meaning
This error appears when Amadeus is unable to match pricing because one or more required elements are missing or not valid:
- No available fare for the route/date
- Booking class (RBD) is not valid for pricing
- Carrier is not included in the fare rule
- Passenger type (ADT / CHD / INF) is missing or incorrect

How to Fix It
- Reprice the itinerary using:
FXR OR FXB