Data changing when adding legend

Hi Anonymous ,

Try the following formula:

Earliest_book = 
CALCULATE(
    MINX(
        ALLSELECTED('CALC NP''s (Uniek)'),
        'CALC NP''s (Uniek)'[Datum boeking]
    ),
    GROUPBY(
        'CALC NP''s (Uniek)',
        Datum[Week],
        'CALC NP''s (Uniek)'[Patiëntnummer]
    )
)

Count_Patiëntnummer = 
CALCULATE(
    DISTINCTCOUNT('CALC NP''s (Uniek)'[Patiëntnummer]),
    FILTER(
        ALLSELECTED('CALC NP''s (Uniek)'[Datum boeking]),
        'CALC NP''s (Uniek)'[Datum boeking] = [Earliest_book]
    )
)

If the problem is still not resolved, please provide detailed error information or the expected result you expect. Let me know immediately, looking forward to your reply.

Best Regards,
Winniz

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