External Web Service appear in VC as "Service Name - Not Supported"

Guys,

I am trying to set up an external Web Service in the Services Registry to use with Visual Composer 7.1.

But the services appear in VC with a message beside each operation that says: "web service name - not supported".

Check image: http://www.4shared.com/file/96030585/d4bd6ad8/VC-NotSupported.html

WSDL has been registered in the Services Registry, it has a proper Destination (under Destination Template) that allow all the operations to appear in VC. This Web Service does not need any password (so Authentication is None). I have tried both:Transfer Protocol: Transfer by HTTP and SOAP header.

It looks like a security issue, but I am not sure. Would you have any clue?

Thanks!