aggregation on the Sum of the Max ot items

I have a business issue in SSAS which is I want to aggregate the Max on a many to many context by this example

DimEmployee

EID      ENAME

1         John

2         Tom

DimDeals

DID             DNAME

1                Deal1

2                Deal2

So now both John and Tom can impact on Deal1 with 200$, 400$

what I want is to find each and everyone's impact normally but when Aggregate on Tom and John the value to be the Maximum (400$) not the sum of it (600$). any solutions ?

I have total access on data warehouse and Cube to do whatever could help

Wagdy Ishac www.sqldair.com