Overall scale in titlefield (backingsheet)

I would like to use the scale from the first view as overall scale in titlefield. How to I do this in my backingsheet?

#VRAT[1]<FR VIEW>:#VRAT[2]<FR VIEW> does not work, probably because it doesn't know which view to get the text from.

#VRAT[1)<FR =134237783/13761>:#VRAT[2]<FR =134237783/13761> does work but this in not generic.

Any suggestions?