XML port as WS function argument

Hi all,

I have created a simple xmlport and codeunit for data import using webservice. If I try to see wsdl in the browser I get this error:

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"&gt;
<s:Body>
<s:Fault>
<faultcode xmlns:a="urn:microsoft-dynamics-schemas/error">
a:Microsoft.Dynamics.Nav.Types.Exceptions.NavNCLNoExecutePermissionException
</faultcode>
<faultstring xml:lang="lt-LT">No execute permission on '' XmlPort with ID 50002.</faultstring>
<detail>
<string xmlns="http://schemas.microsoft.com/2003/10/Serialization/">No execute permission on '' XmlPort with ID 50002.</string>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>

http://i.imgur.com/V1SHO.jpg

For testing purposes I have tried to add any standard xmlport instead of mine and I got the same error.

Anybody has any ideas what might be wrong?