Summarizecolumns and AddMissingItems cannot be used in this context

[LamSar]

Good afternoon,
I have this measure:
_Effectief Aantal Dagen met FiliaalAfsluit:=
Var berekening = CALCULATE(COUNTROWS(SUMMARIZECOLUMNS(FiliaalAfsluit[SK_Datum], FiliaalAfsluit[SK_Partij])), FILTER(Partij, Partij[Keten] in {"CR", "DH"}))
return
berekening

This measure works fine in Power BI desktop. But when I add it to the tabular model I get this error:
Summarizecolumns and AddMissingItems cannot be used in this context

Any ideas on how I need to change this measure? 

Thank you. 

[johnt75 · Accepted solution]

You can't use SUMMARIZECOLUMNS in a measure, try using SUMMARIZE instead

_Effectief Aantal Dagen met FiliaalAfsluit :=
VAR berekening =
    CALCULATE (
        COUNTROWS (
            SUMMARIZE (
                FiliaalAfsluit,
                FiliaalAfsluit[SK_Datum],
                FiliaalAfsluit[SK_Partij]
            )
        ),
        FILTER ( Partij, Partij[Keten] IN { "CR", "DH" } )
    )
RETURN
    berekening