Can't print or export to A3 : option no available

[JMGmusic]

@Ccmp

I have setup my Full Score layout options to A3.
I will (print or) export it to A3, I can’t select, it’s not available.
Schermafbeelding 2016-10-28 om 13.52.14.png
Schermafbeelding 2016-10-28 om 13.52.33.png

I can print in A3. But I have a A3 printer/scanner installed.