Return Soap Fault in CF web service

How do I return a Soap Fault like this:

      <soapenv:Fault>

         <faultcode>soapenv:Client.Validation</faultcode>

         <faultstring>SalesCode must be 5 characters in length</faultstring>

        ...

      </soapenv:Fault>

instead of a CFCInvocationException?