Employee Turnover

Siddiq8686 
The final report looks like this

Make sure you adjust relations like this


Following are the measures' code:

Employee Left = SUM ( Separation_Data4[FTE] )

Population = 
VAR MonthlyPopulation =
    SUM ( Payroll_Merge_File[FTE] )
VAR QuarterAveragePopulation =
    CALCULATE ( 
        AVERAGE ( Payroll_Merge_File[Quarterly Population] ),
        ALLSELECTED (Calendar_Table ),
        CROSSFILTER ( Calendar_Table[Date], Payroll_Merge_File[Payroll Proces Date], None ),
        USERELATIONSHIP (Calendar_Table[Year Quarter], Payroll_Merge_File[Year Quarter] )
    )
VAR Result = 
    IF (
        HASONEVALUE ( Calendar_Table[Year Month] ),
        MonthlyPopulation ,
        QuarterAveragePopulation 
    )
RETURN
    Result 

Monthly Turnover = 
DIVIDE (
    [Employee Left],
    [Population]
)

This solution is working fine