3822794 - What is the Roomit-CSS session log error: Calling endpoint failed: HotelService2-brief : The 'Code' attribute is invalid - The value 'USA' is invalid according to its datatype 'ISO3166' - The Pattern constraint failed?

I was unable to book a Roomit-CSS hotel in Concur Travel. I looked in the session logs and found this error in the hotel sell response.  What does mean and what should I do now?

Calling endpoint failed: HotelService2-brief : The 'Code' attribute is invalid - The value 'USA' is invalid according to its datatype 'ISO3166' - The Pattern constraint failed?

Error found in Session logs: Calling endpoint failed: HotelService2-brief : The 'Code' attribute is invalid - The value 'USA' is invalid according to its datatype 'ISO3166' - The Pattern constraint failed , KBA , CON-INT , Integrations , CON-MOB-TRV-HTL , Hotel , Problem