Can't consume GlassFish generated WSDL from .NET - wcf

Question

I am trying to add a web service reference to my C# application in Visual Studio. The web service is hosted on Sun's GlassFish server. Unfortunately Visual Studio produces the following warning when I try to add the service reference:
Custom tool warning: The following Policy Assertions were not Imported:
XPath://wsdl:definitions/wsdl:binding[#name='SecurityWebServicePortBinding']/wsdl:operation[#name='RegisterUser']
Assertions:
<wsat:ATAlwaysCapability xmlns:wsat='http://schemas.xmlsoap.org/ws/2004/10/wsat'>..</wsat:ATAlwaysCapability>
Apparently it cannot understand policy assertions in the WSDL published by the GlassFish server. Here's an excerpt from the WSDL:
<?xml version='1.0' encoding='UTF-8'?>
<definitions
xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
xmlns:wsp="http://www.w3.org/ns/ws-policy" xmlns:wsp1_2="http://schemas.xmlsoap.org/ws/2004/09/policy"
xmlns:wsam="http://www.w3.org/2007/05/addressing/metadata"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:tns="http://test/securityservice.wsdl"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://schemas.xmlsoap.org/wsdl/"
targetNamespace="http://test/securityservice.wsdl"
name="SecurityService">
<wsp:Policy xmlns:wsat="http://schemas.xmlsoap.org/ws/2004/10/wsat" wsu:Id="SecurityWebServicePortBinding_AuthenticateUser_WSAT_Policy">
<wsat:ATAlwaysCapability />
<wsat:ATAssertion xmlns:ns1="http://schemas.xmlsoap.org/ws/2002/12/policy" wsp:Optional="true" ns1:Optional="true" />
</wsp:Policy>
<wsp:Policy xmlns:wsat="http://schemas.xmlsoap.org/ws/2004/10/wsat" wsu:Id="SecurityWebServicePortBinding_RegisterUser_WSAT_Policy">
<wsat:ATAlwaysCapability />
<wsat:ATAssertion xmlns:ns2="http://schemas.xmlsoap.org/ws/2002/12/policy" wsp:Optional="true" ns2:Optional="true" />
</wsp:Policy>
...
<binding name="SecurityWebServicePortBinding" type="tns:SecurityWebService">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document" />
<operation name="RegisterUser">
<wsp:PolicyReference URI="#SecurityWebServicePortBinding_RegisterUser_WSAT_Policy" />
<soap:operation soapAction="RegisterUser" />
<input>
<wsp:PolicyReference URI="#SecurityWebServicePortBinding_RegisterUser_WSAT_Policy" />
<soap:body use="literal" />
</input>
<output>
<wsp:PolicyReference URI="#SecurityWebServicePortBinding_RegisterUser_WSAT_Policy" />
<soap:body use="literal" />
</output>
<fault name="UsernameExistsException">
<soap:fault name="UsernameExistsException" use="literal" />
</fault>
</operation>
</binding>
...
</definitions>
If I remove all the policy elements from the WSDL, Visual Studio is able to consume the service without any problems (in fact earlier I used to write the WSDL by hand and never put the policy statements). So my questions are:
Why is GlassFish insisting on adding the policies? Is there any way to suppress them?
Why is Visual Studio not able to consume the WSDL with the policies?

Answer 1

ws-AT (Atomic Transactions) seems to be part of the SOAP specification which WCF does not know about.
There is some information here - http://schemas.xmlsoap.org/ws/2004/10/wsat/
Update: Actually WCF is aware of the ws-AT spec, but doesn't support it fully (http://schemas.xmlsoap.org/ws/2004/10/wsat/). I suppose this is because WCF has alternatives which use OleTransactions.

Answer 2

Ok, I figured out why GlassFish is adding the ws-AT policies. My web service is being generated using an EJB (see below):
#Stateless
#WebService
public class SecurityWebService {
...
}
Since the default transaction attribute for a stateless EJB method is REQUIRED, GlassFish is making the web service method transactional too (see here for details). Not the behavior I want, but that's how it is!