Expression is not working in Sense

[prma7799]

Dear All,

I have one set expression which is not working in Sense

SUM({$<FinancialYear=,MonthName=,FiscalYear={$(=max(FiscalYear)-1)} ,

[Posting Date]={">=$(=MonthStart(max({$<FiscalYear={$(=max(FiscalYear))}>}[Posting Date]),-12))<=$(=addmonths(max({$<FiscalYear={$(=max(FiscalYear))}>}[Posting Date]),-12))"}

>}[Sales])

Can anyone help me out.

Thanks