flattened pivot table and cross join relation

Question

I want to use flattened pivot table to get a table of two column (Branch Name , Customer Code )

My model contains 2 tables for branch and Customer and the relation is define between these 2 tables

When I drag Branch Name to row labels and then drag customer Code , I found the customer code is repeated across all branch ,

While the model describe the relation as 1 to many , the pivot table show it as Many to many relation 

I need to display the data as if I wrote Branch Left join Customer ,   Not Branch cross join customer 

Is it possible , is power pivot the correct tools ?

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khaled Mohamed