Calculated Column for delta calculation with previous row (lead/lag)

ferzfeld add new column using following expression:

Delta New = 
VAR __currentDate = Delta[entry_date]
VAR __filter = ALLEXCEPT ( Delta, Delta[kpi_id],Delta[Notes] )
VAR __previousDate = 
CALCULATE ( 
    MAX ( Delta[entry_date] ), 
    __filter, 
    Delta[entry_date] < __currentDate 
)
VAR __previousSales = 
CALCULATE ( 
    MAX ( Delta[Actual] ), 
    __filter, 
    Delta[entry_date] = __previousDate 
)
RETURN 
IF ( NOT ISBLANK ( __previousSales ), 
    Delta[Actual] - __previousSales
)

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