VMBGPO changing (removing) addresses

On a VMBGPO FW 1845, all the 5 addresses are set and I want to remove those unused for Pushbuttons 17-24 and 25-32. When I uncheck those 2 addresses and Writing changes, the module icon comes back with a red cross. I’ve tried on a VMBELO and there, it works !
VelbusLink is V 10.6.5

Have you tried setting the sub addresses to FF ?

Thanks for the tips but when you unckeck the address it goes to FF. I’ve tried to do it manualy > it doesn’t work.

I’ve tried with other modules with FW 1817 and it works ! Bug in FW 1845 ?