Mike,

I am not entirely sure if this is the answer you are looking for, but here
goes. When using WSE 2.0, exceptions will be wrapped in a SoapException. The
InnerException property of the SOAP exception object will be the original
exception.

Have you created that constraint exception class yourself? If so, is it
serializable? To make an exception that inherits from ApplicationException
serializable, you will need to do more than just add the
SerializableAttribute. You also ened a public constructor that takes two
specific arguments and an overridden GetObjectData method.

If you are not using WSE 2.0, then you're probably posting in the wrong
group. In that case, try
microsoft.public.dotnet.framework.aspnet.webservices

HTH,