Use Calender table in Month On Month (MOM) calculation not working

[Wisselaar]

I need to calculate a month on month (MOM) of a measure, Error Percentage. This works only if I use the data from the Error-table itself, but I'd like to use the related Calender table. If not, filtering on a reportpage doesn't work.

The error-table and the calendertable are linked using a data as an integer. 

Any help would be great.

So this works:

Error % MOM % = 

VAR Prev =
    CALCULATE(AVERAGE(ErrorTotalsMonth[Error % (EOM)]); DATEADD(ErrorTotalsMonth[Date End Of Month]; -1; MONTH))

VAR Cur =
    CALCULATE(AVERAGE(ErrorTotalsMonth[Error % (EOM)]))

VAR Result =
    DIVIDE((Cur-Prev); Prev; 0)

RETURN IF(NOT(Cur = BLANK()); Result; BLANK())

But this doesn't:

Error % MOM % = 

VAR Prev =
    CALCULATE(AVERAGE(ErrorTotalsMonth[Error % (EOM)]); DATEADD(_CalenderTable[Date]; -1; MONTH))

VAR Cur =
    CALCULATE(AVERAGE(ErrorTotalsMonth[Error % (EOM)]))

VAR Result =
    DIVIDE((Cur-Prev); Prev; 0)

RETURN IF(NOT(Cur = BLANK()); Result; BLANK())

[v-stephen-msft]

Hi @Wisselaar ,

Is there a relationship between your calendar table and error-table?

After you create a relationship, you can filter the dates in the calendar table.

For more information, you can kindly refer to:

https://docs.microsoft.com/en-us/power-bi/transform-model/desktop-create-and-manage-relationships

Best Regards,

Stephen Tao

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[amitchandak]

@Wisselaar , are you taking Date end of month column from _calendatTable, If not use from there.

Also, try a formula like the one given below as in the example

MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD('Date'[Date]))
last MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(dateadd('Date'[Date],-1,MONTH)))
last month Sales = CALCULATE(SUM(Sales[Sales Amount]),previousmonth('Date'[Date]))
this month =MTD Sales = CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFMONTH('Date'[Date])))
last MTD (complete) Sales =  CALCULATE(SUM(Sales[Sales Amount]),DATESMTD(ENDOFMONTH(dateadd('Date'[Date],-1,MONTH))))
previous month value =  CALCULATE(sum('Table'[total hours value]),previousmonth('Date'[Date]))