The tax authority in Iceland are using Soap web services. I have built XML Ports in NAV to create the request XML and another one to read the response XML.
I already wrote about using stylesheet to strip namespaces from the incoming XML before passing it to the XML Port. I previously just added namespaces to the outgoing XML with attributes in the request XML Port. This does not work in Role Tailored Client.
The solution was to remove all the namespaces attributes from the request XML Ports and create a function to add namespaces to the XML before passing it to the web server. This work both in Classic Client and in Role Tailored Client.