Bidirectional cross-filtering for many-to-many

1. Modify the cross filter direction of the relationship between Accounts and CustomerAccount to Both.
2. Create a simple testing visual by customer to validate the impact of the bi-directional cross-filtering behavior.

• A report visual by customer will now correctly display both the total amount from the fact table ($1,400) and the amounts associated with each customer.
• A DAX alternative to the bidirectional relationship is the following:

M2M Tran Amount = CALCULATE([Tran Amount],SUMMARIZE(CustomerAccount,Accounts[Account ID])) 

• SUMMARIZE() leverages the one-to-many relationships of Customers and Accounts to the bridge table and, via CALCULATE(), passes the filter context of Customers to the Accounts table, which filters transactions.