DAX for calendar filter controlling two tables

[MWinter225]

Hello all,

Currently I have a working report where I am controlling the displayed yearly data from two tables by a slicer on the page which is a year column slicer from the calendar. How I set up the report is that the user will select a single year and the data from the two tables filter on the page and it shows only the data for that year using the measure below:

Policies =
CALCULATE (
    DISTINCTCOUNT ( 'Table1'[Policy Number] ),
    FILTER (
        'Table1',
        MAX ( 'Calendar'[Year] ) = 'Table1'[Policy Effective Year]
    )
)

Everything works great but now they want a multiple year select and I can't for the life of me figure out the measure for that. So now I want them to be able to select multple years and have the measure return the distinct count of policies for all the years selected. I imagined that the DAX would look something like this but it isn't working:

Policies =
CALCULATE (
    DISTINCTCOUNT ( 'Table1'[Policy Number] ),
    FILTER (
        'Table1',
        ALLSELECTED( 'Calendar'[Year] ) IN {'Table1'[Policy Effective Year]}
    )
)

Any suggestions? I feel like this should be easy but its not. I can't just use a straight slicer of [Policy Effective Year] because I need that year slicer to control for both Table1 and Table2. No PBIX to share. Let me know if you have any more questions! Thanks!

[MWinter225 · Accepted solution]

I figured it out:

Policies =
VAR selectedYears =
    VALUES ( 'Calendar'[Year] )
RETURN
    CALCULATE (
        DISTINCTCOUNT ( 'Table1'[Policy Number] ),
        FILTER (
            ALL ( 'Table1'[Policy Effective Year] ),
            'Table1'[Policy Effective Year] IN selectedYears
        )
    )