Filter on a measure

[Kpham]

PreviousWeekVulnerabilites = CALCULATE(SUM('FACT'[Count]),DIM_DATE[Index]=177-1)

Measure 2dim = MAX(DIM_DATE[Current Index])-1

PreviousWeekVulnerabilites = CALCULATE(SUM('FACT'[Count]),DIM_DATE[Index]=[Measure 2dim])

Can somebody help with the above dax code? The first line does exactly what I need. How ever the value 177 is the index of the current week and I want to make this dynamic. Measure 2dim should give the same result as 177-1, however i'm getting the message:
How should I make the statement so that I get rid of the error. I'm trying to get the count of last week vulnerabilities. 

[Ashish_Mathur]

Hi,

Does this measure work?

PreviousWeekVulnerabilites = CALCULATE(SUM('FACT'[Count]),filter(values(DIM_DATE[Index])=[Measure 2dim]))

[Fowmy · Accepted solution]

@Kpham 

Can you try the following modified measure:

PreviousWeekVulnerabilites = 
var __date = MAX(DIM_DATE[Current Index])-1 return
CALCULATE(
    SUM('FACT'[Count]),
    DIM_DATE[Index]=__date
)