Mididevice panel

Creating a midi device panel do not fully support 14bit midi. I created a device panel for my Arthurian MatrixBrute using the 14bit feature for some messages. In essence I can control from the Cubase panel all parameter. But vice versa if I change a parameter on the MatrixBrute directly only the 7bit MIDI messages are updated on the MIDI device panel in Cubase. Is this a bug, or did I do something wrong? I also followed the sequence first to define the parameter and then the knob. Observing the midstream in both directions shows exactly the same messages in both directions. What can I do?