The JSONRPC biding fails when transforming SDO to JSON

The JSONRPC biding fails when transforming my SDOs to JSON (Its OK going JSON->SDO). I can across this when creating the feed aggregator demo. A number of methods in the demo service return SDO and they all failed. It seemed that the JSONROC binding was trying to introspect the underlying EMF classes in order to create the JSON formatted object. If you look at the Alert Aggregator semo you will notice that I manually created a number of SDO like classes, for example, AlertsTypeNonSDOImpl, to get round this issue.