MIDI RPN fine tuning not recognized

Hello
When I send MIDI RPN message, for fine and/or coarse tuning, Pianoteq does not react ( the 440Hz tuning is not changed )...
In the MIDI standard ( http://www.midi.org/techspecs/midimessages.php ),  RPN is use to set the tuning.
Is it possible to implement it ?
I can't see a way to set this RPN message in the Painoteq MIDI settings.

Regards
Franck

Example of calculation used to convert freq in Hz to these RPN values ( if useful .. ) :

    int coarse, coarsemsb , finemsb ;
    float fine;
        // convert Hertz to cents
    float cents = 1200.0 * log2f(freq / 440.0);

    if (cents >= 0)
    {
        coarse = (int)((cents + 50.0)/100.0); // semitone
        fine = cents - 100.0 * (float)(coarse); // cents
    }
    else
    {
        cents = (-1.0)*cents;
        coarse = (int)((cents + 50.0)/100.0);
        fine = cents - 100.0 * (float)(coarse);
        coarse *= -1;
        fine *= -1.0;
    }
    coarsemsb = coarse + 0x40; // RPN coarse tuning
    finemsb = (int)((float)(0x20) * fine / 50.0 ) + 0x40; // RPN fine tuning