Cumulative measure based on dynamic measure – Slicer problem

Hi, need some help with the following:

The Visual

The visual shows the ranking of items based on the last time they were sold ('worst' to 'best')

The ‘PartID’ field is a column from the material table – ‘Products’. The other three fields are measures.

The ‘Cumulative Gap’ measure is a running total of the ‘Gap From Last Transaction’ measure.

 Without using a slicer, the visual shows correct results for all the fields.

The problem

When adding a slicer, and adding ALLSELECTED to the measures, the ‘Gap From Last Transaction’ results are correct but the ‘Cumulative Gap’ shows the whole total in each cell instead of running total (left image)

 If I remove ALLSELECTED from the measures, the ‘Cumulative Gap’ works as expected, but the results of the ‘Gap From Last Transaction’ are incorrect (obviously, because I removed ALLSELECTED) (right image).

these are the measures (i used index column similar to date column):

Gap From Last Transaction =

VAR MaxIndex = MAX ( Sales [ Index ] )

VAR LastBuy = CALCULATE( MAX ( Sales [ Index] ) ,

                        FILTER (ALLSELECTED (Sales) ,

                        Sales [ PartID ] =  FIRSTNONBLANK( Products [ PartID ] ,  Products [ PartID ] ) ) )

RETURN

LastBuy - MaxIndex + 1

Total Gaps =  SUMX ( Products , [ Gap From Last Transaction ] )

Cumulative Gap =

CALCULATE ( [ Total Gaps ] ,

FILTER (

ALLSELECTED( Products [ PartID ] ), SUMX ( Products , [ Total Gaps ] )  <= [ Total Gaps ] ))

Rank =

CALCULATE ( RANKX ( ALLSELECTED ( Products [ PartID] ) ,[Gap From Last Transaction ] ,,DESC ) )

Tanks for the help.