The generated web services always use tempui.org as the namespace.

The recommended work around for this is to write your own web service proxy class by deriving from WorkflowWebService. Here's a rough sample which we recommend. After talking to the dev team about this we're considering putting out a sample that helps you generate this more directly.

    [WebServiceBinding]
    [WebService(Namespace="http://www.customname.com")]
    public class myWFWebService : WorkflowWebService
    {
        public myWFWebService()
            : base(typeof(Workflow1))
        {
        }


        [WebMethod]
        public virtual string myMethod(string s)
        {
            return (string)base.Invoke(typeof(Interface1), "myMethod", true, new object[] { s })[0];
        }
    }

The above sample is for an interface that’s like this:

    interface Interface1
    {
        string myMethod(string s);
    }

Another solution can be found http://nayyeri.net/archive/2007/04/05/how-to-create-a-webservice-based-on-a-workflow.aspx