Files generated in 32bit Powerpivot, 64bit errors

[ma7pmb]

Hi

I am having issues with measures that were built in Powerpivot 32bit.

The measures are in the form:
Booking_2012:=calculate('vXXXX'[Sum of Bookings],'vXXXX'[Year]="2012") with vXXXX the tab name.

I have reopened on the 32bit machine and measures are still valid, but have the following error in 64 bit:
Semantic Error: Dependency error in the measure

Can anybody please advise if there is a way to update the file or a way around this

Thanks,

Peter