Headcount Calculation

Hi nareshr89 

Apologies for the late reply. I was out of office all day. 
Please try by replacing SELECTEDVALUE ( Dim_time[MonthLoad] ) with MIN ( Dim_time[MonthLoad] ) for Opening HC and MAX ( Dim_time[MonthLoad] ) for Closing HC

Thanks for reverting tamerj1.

Found the solution using similar logic for the YearMonth ID.

F_OpeningHC =
var yr = SELECTEDVALUE(Dim_time[Year])
var ml = SELECTEDVALUE(Dim_time[MonthLoad])
VAR yearmonth = CALCULATE(MIN(sf_CSS[time_id]),sf_CSS[sf_year]=yr,sf_CSS[sf_month_load]=ml)

Return
CALCULATE(SUM(sf_CSS[hc_opening]),sf_CSS[sf_year]=yr,sf_CSS[sf_month_load]=ml,sf_CSS[time_id]= yearmonth)

F_ClosingHC =

var yr = SELECTEDVALUE(Dim_time[Year])
var ml = SELECTEDVALUE(Dim_time[MonthLoad])
VAR yearmonth = CALCULATE(MAX(sf_CSS[time_id]),sf_CSS[sf_year]=yr,sf_CSS[sf_month_load]=ml)

Return
CALCULATE(SUM(sf_CSS[hc_closing]),sf_CSS[sf_year]=yr,sf_CSS[sf_month_load]=ml,sf_CSS[time_id]=yearmonth)