Is this SOAP Envelope valid?

[circuit_breaker]

Hi,

I have a .NET WebService that accepts 3 parameters. Using the same
request below but with only 2 parameters, it works, but not with one,
three and so on...

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<SayHello xmlns="http://tempuri.org/">
<one>Linux Rulez!!!!!!!</one>
<two>Structure 2</two>
<three>Structure 3</three>
</SayHello>
</soap:Body>
</soap:Envelope>

Here's the answer I'm getting back from IIS when I try to send
something else than 2 parameters. And yes, I did recompile the thing
on the .NET :)

inputline: Server: Microsoft-IIS/5.0
inputline: X-Powered-By: ASP.NET
inputline: HTTP/1.1 500 Internal Server Error.
inputline: Date: Mon, 02 May 2005 13:13:52 GMT
inputline: Connection: close
inputline: Cache-Control: private
inputline: Content-Length: 533
inputline: <?xml version="1.0" encoding="utf-8"?>
inputline: <soap:Body>
inputline: <faultcode>soap:Client</faultcode>
inputline: <detail />
inputline: </soap:Body>
inputline: null
Your help would be very much appreciated. Thanks.