Sum of grand total of transactions

Hi, 

 

I am trying to sum a column within a module on open balances for all of my bill-to Customers. The reason for me doing this is I have them by aged deductions and then I used the SUM function onthe aging buckets to get the total of that particular customer. Now I would like a calculation that tells me what the percentage of that Customer has open compared to the overall balance of all Bill-To Customers.

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