Ignoring filter context in a DAX Measure while using variables

Hi all,

I’m struggling in creating a measure and could use your help:

I need a Measure that first checks, if a framework contract (DIM_Frameworkcontract) is active in a given time period.

If the contract is active, I want to sum the invoice amount for that vendor.

I already created the measure and it works, if you look at the data on a monthly perspective.

However, if I want to aggregate the data in a visual on a yearly basis the measure doesn’t work as I expected.

I assume this is due to the filter context in the matrix visual, but I don´t know how to fix it..

Please find attached the measure, screenshots of the data model and the expected output.

Measure

Invoice amount on contract = 
VAR selectedDate =
    MAX ( DIM_Date[Date] )
RETURN
    SUMX (
        Fact_Invoices,
        VAR StartDatum =
            RELATED ( 'DIM_Frameworkcontracts'[Startdate] )
        VAR EndDatum =
            RELATED ( 'DIM_Frameworkcontracts'[Enddate] )
        RETURN
            IF (
                StartDatum <= selectedDate
                    && OR ( EndDatum >= selectedDate, EndDatum = BLANK () ),
                Fact_Invoices[Invoice Amount],
                0
            )
    )

Datamodel

DIM_Frameworkcontracts

The contract is valid from 2019-10-01 and the measure „Invoice amount on contract“ should therefore sum up the the invoice amount in the month 2019-10, 2019-11 and 2019-12 for 2019 total.

Output