Distinct Count of requests for last 12 months and exclude current month

[johhnybest]

Hello,

I m looking to get distinct requests count (string value) from last 12 months and exclude current month data/count in my measure, 

I used below measure but end up getting incorrect values 

Unique requests= CALCULATE(DISTINCTCOUNT(Exec[requests]),DATESINPERIOD('Exec'[ReqDate],eomonth(MAX('Exec'[ReqDate]),-1),-12,MONTH))

 

Expected result: 

 I used Unique Requests =

     DISTINCTCOUNT(Exec[ConversationID])  (but this data will not exclude current month)

Thanks in advance

[lbendlin]

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