Gets or sets the unique id for the salesseason in which the Rate is being valued, that is used to caculate the Upsell-Rate for this request.
This property is mandatory. The value for this parameter should be taken from the SalesSeasonId-property of the Rate, the Upsell-Rates are requested for.
RateServiceUpsellRequest Class | SunnyCars.Schema.Osi.WsReservation.V4 Namespace