Create simple DAX Measure

Hi arunh100 

Please try the following possible solution:

YTDMeasure = 
VAR MaxMonthYear = CALCULATE(MAXX(ALL('Exceptions'), 'Exceptions'[CreatedMthYr]))
VAR CurrentMonthYear = SELECTEDVALUE('Exceptions'[CreatedMthYr])
VAR CurrentMonth = MOD(VALUE(CurrentMonthYear), 100)
VAR CurrentYear = INT(DIVIDE(VALUE(CurrentMonthYear), 100, 0))
VAR PreviousMonthYear = IF(
    CurrentMonth = 1,
    (CurrentYear - 1) * 100 + 12,
    CurrentYear * 100 + (CurrentMonth - 1)
)
VAR CurrentMonthExceptions = CALCULATE(
    COUNT(Exceptions[Task ID]),
    'Exceptions'[CreatedMthYr] = CurrentMonthYear
)
VAR PreviousMonthExceptions = CALCULATE(
    COUNT(Exceptions[Task ID]),
    'Exceptions'[CreatedMthYr] = PreviousMonthYear
)
VAR PreviousMonthExceptionsWithZero = IF(
    ISBLANK(PreviousMonthExceptions),
    0,
    PreviousMonthExceptions
)
VAR YTDExceptions = IF(
    CurrentMonthYear = MaxMonthYear,
    CurrentMonthExceptions + PreviousMonthExceptionsWithZero,
    CurrentMonthExceptions
)
RETURN YTDExceptions

Best Regards,
Jarvis Tang
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