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Hi, Anonymous 

You can try the following formula.

Duplicate =
VAR _dCount =
    COUNTROWS (
        FILTER (
            'DB 15092022_1',
            'DB 15092022_1'[STO Number] = EARLIER ( 'DB 15092022_1'[STO Number] )
                && 'DB 15092022_1'[Index] <= EARLIER ( 'DB 15092022_1'[Index] )
        )
    )
RETURN
    IF ( _dCount > 1, 1, 0 )

If you have a large amount of data, you can try to calculate with measure.
Measure:

Duplicate =
VAR _dCount =
    COUNTROWS (
        FILTER (
            ALL ( 'DB 15092022_1' ),
            'DB 15092022_1'[STO Number] = SELECTEDVALUE ( 'DB 15092022_1'[STO Number] )
                && 'DB 15092022_1'[Index] <= SELECTEDVALUE ( 'DB 15092022_1'[Index] )
        )
    )
RETURN
    IF ( _dCount > 1, 1, 0 )

Best Regards,

Community Support Team _Charlotte

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