Group by order

You really do not need a measure for this, just create a table visualization and then use the default Max aggregation on your precition column. So ordre and precition in the table visualization. 

Hi, Anonymous 

Based on my research, you may create a measure as below.

Sum of Max = 
SUMX(
    ADDCOLUMNS(
        SUMMARIZE(
            'Table',
            'Table'[order]
        ),
        "Max",
        CALCULATE(
            MAX('Table'[precition]),
            FILTER(
                ALL('Table'),
                'Table'[order] = EARLIER('Table'[order])
            )
        )
    
    ),
    [Max]
)

Result:

You can also create a calculated table as below

NewTable = 
ADDCOLUMNS(
        SUMMARIZE(
            'Table',
            'Table'[order]
        ),
        "Max",
        CALCULATE(
            MAX('Table'[precition]),
            FILTER(
                ALL('Table'),
                'Table'[order] = EARLIER('Table'[order])
            )
        )
    
)

Result:

Best Regards

Allan

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