Changes to related ValueLists using <unknown> in FMP 12

Dear All,

I have a "nested Value List" solution (value of a field set by ValueList A filters values in ValueList B ) that has worked through a number of versions of FMP upto and including FMP 11. It now fails in FMP12. It's based on using the Include only related values starting from but then leaving the field set to <unknown>. Which was a trick somebody passed onto me years ago. Basically it worked along the lines of : if the valuelist is the product of a relationship, filter by that relationship, reverting to include all values, obviously returns all values. ARe you aware of any changes to this area in FMP12?

thanks in advance

Giles