How to avoid double counting for Sums?

Thank Ahmedx  for his prompt reply.

Hi Anonymous  ,

Depending on the information you have provided, I created a sample data to help you solve your problem. You can follow these steps below.
Sample data:

1.Add new measure.

Sum of Trx = 
VAR _PersonID =
    SELECTEDVALUE ( 'Table'[Person_ID] )
VAR _CountProj =
    CALCULATE (
        DISTINCTCOUNT ( 'Table'[Proj_ID] ),
        FILTER ( 'Table', 'Table'[Person_ID] = _PersonID )
    )
RETURN
    DIVIDE ( SUM ( 'Table'[Trx] ), _CountProj )

 Final output:

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Best Regards,

Ada Wang

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