QML OrganizerModel missing qRegisterMetaType

Creating a simple QML based app with QtMobility.organizer can not find any
entries.
Example qml-contents:

OrganizerModel {
        id:organizerModel
        autoUpdate: true
        startPeriod: '2010-01-01'
        endPeriod:'2012-12-31'
    }

    ListView {
        id:organizerList
        anchors.fill: parent
        model:organizerModel
        delegate: Label {
            text:model.item.displayLabel
        }
    }

This is caused by a missing metatype (console output):
QObject::connect: Cannot queue arguments of type 'QOrganizerAbstractRequest::State'
(Make sure 'QOrganizerAbstractRequest::State' is registered using qRegisterMetaType().)

I can manually add this

qRegisterMetaType<QOrganizerAbstractRequest::State>("QOrganizerAbstractRequest::State");

to the c++ application code to overcome this issue. But it isn't obvious and shouldn't be
necessary.