Filter by selected rows

In the video he got 2 fields in the fact, which he wants to compare (order date / delivery date). And so he can duplicate his DimTable (dimDate) for his relations. I can't implement this, because I only have 1 field for the relations.

In my case, my fact table looks like:

When i select the first bar in the histogram for August (0-20%), i wanna see the value of the Positionnr "123" in the second chat (filtered for September).

I tried arround to use the DimPositiondata for that and a measure with crossfilter like

CountCurrentMonthCross = CALCULATE(
    COUNT( 'Positiondata'[Planposition]), 
    CROSSFILTER('Füllgrad'[Planposition], Positiondata[Planposition], Both), 
    'Füllgrad'[Month] = DATE(YEAR(today()), month(today()), 1), 
    'Füllgrad'[Value] >= 0,'Füllgrad'[Value] < 1
) 

CountNextMonthCross = CALCULATE(
    COUNT( 'Positiondata'[Planposition]), 
    CROSSFILTER('Füllgrad'[Planposition], Positiondata[Planposition], Both), 
    'Füllgrad'[Month] = DATE(YEAR(today()), month(today()) +1, 1), 
   'Füllgrad'[Value] >= 0,'Füllgrad'[Value] < 1
) 

But the second chart still gets filtered by the selected value of the x-axis when I select the first bar in the first chart.
I tried around with ALL(), ALLSELECTED(), REMOVEFILTERS(), etc. but this messes up the whole chart (all bars get the same size, etc.)