public static void UpdateTaxWithholdingAgreement()
        {
            var binding = new BasicHttpBinding();
            binding.MaxReceivedMessageSize = Int32.MaxValue;

            var target = new bfsapi.bfsapiSoapClient(binding, new EndpointAddress("http://localhost:20010/bfsapi.asmx"));

            var req = new bfsapi.UpdateTaxWithholdingAgreementsRequest()
            {
                Credentials = new bfsapi.Credentials
                {
                    UserName = "user",
                    Password = "password"
                },
                identify = "identify",
               
                Fields = new bfsapi.UpdateTaxWithholdingAgreementFields()
                {
                    
                   TaxCountry = true,
                   ExpirationDate = true
                   

                },
                Entities = new bfsapi.UpdateTaxWithholdingAgreement[]
                {
                    new bfsapi.UpdateTaxWithholdingAgreement
                    {
                        BrickId = new Guid("eef95a05-d151-4f37-8f24-d1b5e319e497"),
                        TaxCountry = "SE",
                        ExpirationDate = DateTime.Today
                       
                    }
                }


            };

            var resp = target.UpdateTaxWithholdingAgreements(req);

        }