<HandlerName>PreHandlerInvoke : Altering the XML that came from the 3rd party before it enters into N4 machinery.
<HandlerName>PostHandlerInvoke : Altering the request that came back from the webservices call before it goes to the caller.
If an error happens in the preinvoke and disrupts the flow we will exit before even starting the webservices transaction. These are currently