Conditional filtered average in line chart

Hi Anonymous 

If I understand correctly, you always want the value for the country regardless of the level selected at the slicer. If so:

Measure =
VAR country_ = SELECTEDVALUE ( Data[Country] )
RETURN
    CALCULATE (
        SUM ( Data[Sales] ),
        Data[Country] = country_,
        ALL ( Data[Region], Data[City] )
    )

Or since you have Country in the legend, this should suffice:

Measure =
    CALCULATE (
        SUM ( Data[Sales] ),
        ALL ( Data[Region], Data[City] )
    )

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