DAX custom Grand Total not behaving as expected - powerbi

Question

I have a Measure which calculates a cumulative total:
CumulativeCount:=
VAR date1 = MAX( DimDate[Date] )
VAR date2 = MAX( FactTable[EndDate] )
RETURN
CALCULATE (
SUM( FactTable[Count] ),
DimDate[Date] <= date1,
DimDate[Date] <= date2,
ALL( DimDate[Date] )
)
And another, actually used in the Pivot Table, which, when it's calculating the Grand Total, is supposed to add up the cumulative totals for each date:
CumulativeCountForPivot:=
IF (
-- If calculating for one group
COUNTROWS( VALUES( FactTable[Group] ) ) = 1,
-- Do core logic
[CumulativeCount],
-- Else add up the results from each group
SUMX(
VALUES( FactTable[Group] ),
[CumulativeCount]
)
)
I don't understand why the Grand Total in the final column is 12, not 6.

Answer 1

The reason is that the grand total is for GroupA and GroupB combined and there is a cumulative count of 12 on that date (6 for each group).
On 06/01/2017 there are no records for GroupA so the [CumulativeCount] measure is returning a blank, even though there are records before that date and the count would be 6. If you added a record for GroupA with a Count of 0 on 06/01/2017, then you would see 6 appear.
If you want a measure that only shows 6 on that date, then try something like this:
CountForPivot =
VAR TempTable = SUMMARIZE(FactTable,
FactTable[Group],
FactTable[EndDate],
"Cumulative",
CALCULATE(SUM(FactTable[Count]),
FILTER(ALLEXCEPT(FactTable, FactTable[Group]),
FactTable[EndDate] <= MAX(FactTable[EndDate])
)
)
)
RETURN SUMX(TempTable, [Cumulative])