qdbusxml2cpp fails to parse QVariantMap parameters for Signal

Trying to create an Interface to BlueZ gives me an error message "Got unknown type `a

'" and no output file is written.
The compiler says also
You should add <annotation name="com.trolltech.QtDBus.QtTypeName.In1" value="<type>"/> to the XML description

In fact as you can see in the attachement DBUS_BlueZ_Adapter.XML, the proper annotation is provide as an Out paramater... This is normal for a "Signal". But it seems that the compiler expect a In parameter.
The XML file was generated using the qdbuscpp2xml utility from the attached file DBUS_BlueZ_Adapter.h.

If I add the requested line in the XML file, there is no error and the code is properly generated...

I have checked for "Method" with QVariantMap as reply and the cose is properly generated... It seems that problem occurs only for "Signal"...