Hi Samuel,
If all you were interested in was the total overdue and not standard aging buckets, perhaps don't age in 30/60/90 but instead make up different date ranges like 997/997/999 days. Presumably no outstanding invoices are 3 years old, so everything would get reported in the first aging bucket.
If creativity such as this won't work or is not desirable, this is a better job for GridView rather than Filters. Total Overdue is not a stored database value, which is what using Filters requires. You cannot add calculated columns to grids in Adagio, just in GridView.
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Regards,
Softrak Tech Support