Retrieves the first notification object.
The notification is typed as message if the reponseType= enResponsePending or is typed as error if reponseType= enResponseRejected.
The reponseType= enResponseAccepted has no notifications per definition. The responseType is returned in the
GetResponse method.
VARIANT_FALSE is returned if the end of the object list is reached.
If the data stem from loading a lower version XML file, then a compatibility error is issued! If full support is needed for a lower version then there is not resort than using the native COM versions directly.