var binding = new BasicHttpBinding();
    binding.MaxReceivedMessageSize = int.MaxValue;
    binding.Security.Mode = BasicHttpSecurityMode.Transport;
    binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
    binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
    var adresas = new EndpointAddress("http://*****/sap/bc/srt/rfc/sap/z_wbs_element/400/z_wbs/z_wbs");


    ServiceReference1.Z_wbs_elementClient client = new Z_wbs_elementClient(binding, adresas);


    client.ClientCredentials.UserName.UserName = "UserName";
    client.ClientCredentials.UserName.Password = "Password";

    client.Open();

    ServiceReference1.ZpassWbs parameter = new ServiceReference1.ZpassWbs();

    parameter.Bukrs = "4600";

   ServiceReference1.ZpassWbsResponse response = client.ZpassWbs(parameter);

      Console.WriteLine(response.EtWbsElement);

    client.Close();`