I just pulled up the booking I made (planned, booked and issued) without problem a few months ago, ICN-HKG-JFK-MIA-SEA-ORD-LAX-IAH-ORD-AMM-MAD-LHR-DXB-LHR-SIN-HND-GMP. It came back with an error
The following error(s) occured
Error message (7820) not found for Language Code 'GB'
No fare can be found for the flights and/or cabins you selected. Please search again and select another cabin and/or different flights. (5685 - 2201)