Reply to load from deck midi control

Hi everybody,

i've created a template on TouchOSC to control the sampler deck (D) with my ipad but the only thing that doesn't work is the "load from deck" fonction...

i've created the button and assigned it on traktor but it doesn't work... do you know if it's a bug or if there's some tricks i've forgotten ??
Manually it works, but i can make it work using a controller....

any help would be welcome

thanks!