string GetVehicleSearchHeader()
        {
            var gmHeader = new GMHeader();
            Functions.CreateHeader(gmHeader,"VehicleSelector","ExtGetVehicleSpecifications");
            var ga = gmHeader.GMAuthorization = new GMAuthorization();
            ga.TradingPartnerID = "EL";
            ga.BAC = this.bac;
            var result = Functions.Serialize<GMHeader>(gmHeader);

            return result;
        }
        string GetInventorySearchHeader()
        {
            var gmHeader = new GMHeader();
            Functions.CreateHeader(gmHeader);
            var ga = gmHeader.GMAuthorization = new GMAuthorization();
            ga.TradingPartnerID = "EL";
            ga.BAC = this.bac;
            var result = Functions.Serialize<GMHeader>(gmHeader);

            return result;
        }