WCF Generate help for REST POST call - wcf

Question

Using WCF, it is possible to generate help for a webHTTPBinding. With a WebGet operation, it works like charm. Using a WebInvoke (Method = "POST") however doesn't give me any help. In the pages I can see this:
Url:
http://localhost/edumatic3/trunk/services/service.svc/rest/saveUser
HTTP Method: POST
Message direction Format Body
Request Unknown Could not generate schema document.
Response Unknown Could not generate schema document.
Any ideas?
Web.Config system.serviceModel
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="basicHttpBindingConfiguration">
<security mode="TransportWithMessageCredential" />
</binding>
</basicHttpBinding>
</bindings>
<behaviors>
<endpointBehaviors>
<behavior name="HelpEndPointBehavior">
<webHttp helpEnabled="true" automaticFormatSelectionEnabled="false" />
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ServiceBehavior">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
<serviceCredentials>
<userNameAuthentication userNamePasswordValidationMode="Custom"
customUserNamePasswordValidatorType=
"Edu3.Service.OpenApi.Security.CustomUserNameValidator
, Edu3.Service.OpenApi" />
</serviceCredentials>
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="OpenApiService"
behaviorConfiguration="ServiceBehavior">
<endpoint name="soap"
address="soap"
binding="basicHttpBinding"
contract="Edu3.Service.OpenApi.Interface.IService"
bindingConfiguration="basicHttpBindingConfiguration"/>
<endpoint name="rest"
address="rest"
behaviorConfiguration="HelpEndPointBehavior"
binding="webHttpBinding"
contract="Edu3.Service.OpenApi.Interface.IService"/>
<endpoint name="mex"
address="mex"
binding="mexHttpBinding"
contract="IMetadataExchange" />
</service>
</services>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true">
<serviceActivations>
<add relativeAddress="services/service.svc"
service="OpenApiService"
factory="Spring.ServiceModel.Activation.ServiceHostFactory"/>
</serviceActivations>
</serviceHostingEnvironment>
Service Contract:
The GetNodeByKey gives me clear help. The SaveUser not.
[ServiceContract]
public interface IService
{
[OperationContract]
[WebGet(UriTemplate = "login?userName={userName}&password={password}")]
void Login(string userName, string password);
[OperationContract]
[WebGet(UriTemplate = "getNodeByKey/{key}?getAllDescendants={getAllDescendants}"
, ResponseFormat = WebMessageFormat.Json)]
[ServiceKnownType(typeof(BranchNodeDTO))]
[ServiceKnownType(typeof(LeafNodeDTO))]
[ServiceKnownType(typeof(CasusNodeDTO))]
[ServiceKnownType(typeof(BucketNodeDTO))]
NodeDTO GetNodeByKey(string key, string getAllDescendants);
[OperationContract]
[WebInvoke(UriTemplate = "saveUser", Method = "POST"
, BodyStyle = WebMessageBodyStyle.WrappedRequest)]
UserDto SaveUser(UserDto user, int channelId);
}

Answer 1

What about your DataContract? Are there any enums which have FlagsAttribute? It seems that when you use [Flags] WCF isn't able to correctly generate the help page.
Source: http://support.microsoft.com/kb/2020406/en-us