Store a cell format parameter in a Text field and use it is a cube view

I guess it depends on whether that column or rows actually uses a filter on Accounts. MF is for "member filter", and it's supposed to retrieve the member where a filter is specified. E.g. if you have a row defined with "A#BalanceSheet.Base", MFAccount will be populated by the actual Account on expansion, i.e. A#MyNiceAssed, A#MyBadLiability etc etc; but if that row expands on something else, e.g. E#Total.Base, MFAccount won't be populated. If that principle doesn't hold true, it should be reported; at which point, the only option becomes a CV Extender.