Adding a dynamic constant line to barchart using ISINSCOPE

Hi all,

I have got a barchart with a date hierarchy (date, week, month, year).
I want to add a constant line as "target". But the values for target depend on if in the barchart year is selected or month or week...

On YouTube I found a solution - but it just does not work for me 😞

What I have done:

- created a measure:

Target = 
SWITCH(
    TRUE(),
    ISINSCOPE('Kalender'[Date]),50,
    ISINSCOPE('Kalender'[Week]),250,
    ISINSCOPE('Kalender'[Month]),1000,
    ISINSCOPE('Kalender[Year]),12000
)

- in the barchart settings added a contant line on Analytics pane.
Under "Line" I pressed the fx-Button and added the measure.

The constant line is visible but it is always set to 0 - whatever I choose to drill down.

What could be my mistake?