Hi Braedon,
What you want to do is not available in Adagio Receivables as a standard report. You will have to come up with a custom report/inquiry. It will involve using the Customer Transactions file, creating a list of all invoices with a date equal to or less than Dec 31, 2015 and the Current Amount not equal to 0. This would be a fairly routine inquiry to create in Adagio GridView, if you have that program.
You might be able to use the SmartFinder search on the Document number field to accomplish the same search criteria, then export the results to Excel.
Some reports in Adagio that allow backdating and recalculation have labels to indicate that the transaction has been either partially or completely settled by future-dated transactions. It appears that the Aged Trial Balance report is not one of them.
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Regards,
Softrak Tech Support