Switch function financial statement - multiple levels

[JoycevanWijk]

I am building a profit and loss in PowerBI and I'm using a book and youtube tutorials from datatraining.io. 

I have a financial statement structure that contains 2 levels. 

Like this:

I have individual measures calculating the level 1 items. 

Now I want to create a matrix with in the rows the level 1 and level 2.  The column months. 
And the values are the realisation of the rows per month. 

I copied a measure from the book, but in the book there is only one level. So I understand that I need to do something to check if it is a level 1 or level 2 item, and then switch. Right now with this measure the level 1 row is empty and all the level 2 values are shown. 

Realisatie =

Var Keuze = SELECTEDVALUE('Financial Statement Structure'[Line Item ID])

Return

SWITCH(TRUE(),

Keuze = "Omzet", [Omzet Totaal],

Keuze = "Inkoopkosten omzet", [Inkoopkosten Omzet Totaal],

Keuze = "Variabel personeel", [Variabel Personeel],

Keuze = "Operationeel resultaat", [Operationeel resultaat],

Keuze = "Bedrijfsresultaat", [Bedrijfsresultaat],

Keuze = "Resultaat voor belastingen", [Resultaat voor belastingen],

CALCULATE([TOT_BEDRAGEN], FILTER(KOPPELING, KOPPELING[OmschrijvingSubCategorie]=Keuze)))

The financial statement structure does not have any relationship to other tables. 

There is also a table called koppeling, this has 2 columns (Level 1 and level 2). This table is connected to the financial data. 

So how do I rewrite the measure so that it shows the totals at level 1 and values at level 2?

I feel it should be easy, but I'm not getting it to work. Thank you so much for your help!

[JoycevanWijk]

No one? 😞