calculating sum for max date

Hi czaldumbide 

The MAX() in your measure will give you the latest date for the product in that row, since products is part of the filter context. Try this:

Measure =
VAR latestdate_ =
    MAX ( ALL ( 'Sales'[Date] ) )
RETURN
    CALCULATE (
        SUM ( 'Sales'[Amount] ),
        FILTER ( 'Sales', 'Sales'[Date] = latestdate_ )
    )

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Cheers 

There are several things wrong with your code.

First, you are creating a filter out of the whole expanded fact table. THIS IS VERY, VERY BAD and slows down calculations tremendously. If you start doing such calculations on big fact tables, you'll feel the heat instantly. One of the golden rules of DAX programming says: Never filter a table if you can filter a column.

Secondly, you should have a Calendar dimension in your model.

If you do have a proper Calendar, then you can write:

[Latest Sales Amount] =
var __latestSalesDate =
	CALCULATE(
		// This is the very latest
		// day with any sales in it
		// with no regard to any
		// selections in any slicers.
		MAX( Sales[Date] ),
		ALL( Sales )
	)
var __result = 
	CALCULATE(
		SUM( Sales[Amount] ),
		// This only works correctly
		// if Calendar is THE date table
		// in the model.
		Calendar[Date] = __latestSalesDate
	)
return
	__result

Best
D