Ranking with multiple rows and drilldown

Hi again VBLOT 

Thanks so much for the file! That made it a lot easier to debug.

It seems that the problem actually relates to how the visual level filter "Sum of Nb samples collected > 0" interacts with the ALLSELECTED () modifier used to produce the table for ranking.

A safer way to write the measure is below (see attached PBIX). Actually in their Whitepaper, SQLBI recommend this general approach of adding column(s) to the "relation" argument of window functions.

I might have to get back to you with an explanation of why it works when I've analyzed further.

Rank FIX = 
VAR IsLineInScope = ISINSCOPE ( 'Invoices List'[Line Designation] )
VAR IsREFInScope = ISINSCOPE ( 'Invoices List'[REF] )
VAR Result =
    SWITCH (
        TRUE ( ),
        IsLineInScope && IsREFInScope,
            RANK (
                DENSE,
                CALCULATETABLE (
                    ADDCOLUMNS (
                        SUMMARIZE (
                            'Invoices List',
                            'Invoices List'[Line Designation],
                            'Invoices List'[REF]
                        ),
                        "@TotalSamples", [Total Samples collected]
                    ),
                    ALLSELECTED ()
                ),
                ORDERBY ( [@TotalSamples], DESC ), ,
                PARTITIONBY('Invoices List'[REF])
               
            ),
        NOT IsLineInScope && IsREFInScope,
            RANK (
                DENSE,
                CALCULATETABLE (
                    ADDCOLUMNS (
                        SUMMARIZE ( 'Invoices List', 'Invoices List'[REF] ),
                        "@TotalSamples", [Total Samples collected]
                    ),
                    ALLSELECTED ( )
                ),
                ORDERBY ( [@TotalSamples], DESC )
            )
    )
RETURN
    Result

Regards