Find the latest 2 dates

axk180022 try this measure:

Measure 2 = 
CALCULATE ( 
    SUM ( Inv[GENERATORHOURS] ),
    KEEPFILTERS ( 
        TOPN ( 
            2, 
            FILTER ( 
                ALLSELECTED ( Inv ), 
                Inv[INVENTSERIALID] = MAX ( Inv[INVENTSERIALID] ) && 
                Inv[GENERATORHOURS] > 0 
            ), 
            Inv[CALLACTIONDATETIME], DESC 
        ) 
    ) 
)

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