Previous Month with Master Calendar

[triekong]

im trying to get the values for the previous fiscal month and Previous Quarter using set analysis.

My current formula is

Current Month:

=Sum({<FQuarter=,FMonth=, [Date]= ,FYear={$(vMax_Year)}, fMonth={$(vMax_Month)}>}[Actuals])

Current Quarter:

=Sum({<FQuarter=,FMonth=, [Date]= ,FYear={$(vMax_Year)}, FQuarter_Num={$(vMax_Quater)}>}[Actuals])

my fiscal year starts in September .

i don't want to do Fmonth-1, because what if i was in the 1st month of the fiscal year.

Please let me know what i am doing wrong