Fault message structure at PI

Hi,

In one of our scenario my Webservice client said that they will return a SOAP fault message in case of any application error.

The structure will look like as below.

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header/>
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
  <faultcode>SOAP-ENV:Server</faultcode>
<faultstring xml:lang="en">error message</faultstring>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

How do I define my SOAP fault message structure at PI.

I use some XML/xsd converter to convert client fault xml to xds, but it is not giving me correct xsd. faultcode and faultstring getting created as two separate MT.

Regards,

Navneet