a=
VAR a =
DATEADD ( FIRSTDATE ( dim_date2[Date] ), -1, YEAR )
VAR b =
DATEADD ( LASTDATE ( dim_date2[Date] ), -1, YEAR )
RETURN
CALCULATE (
SUM ( V_Fact_Order_Gtin1[trade_cnt] ),
DATESBETWEEN ( dim_date2[Date], a, b )
)
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