Customer Aging Balances not progressing to past due

Hi,

I have a bunch of Customers with invoices (generated via the Invoice Entry Screen) whose balances due are only showing under Current Balance in the Customer Activity Screen. Their balances are not showing in the 1-15 days, 16-45 days, etc. Past Due textboxes under the Aging Balances section. For example, an unpaid invoice with a Doc Date of 11/15/2016 is still only showing under Current Balance.

The Aging balances are stored in the AR_Balances table.

What process progresses the Customer's Aging Balance from Current to 1-15 Days past Due Date, 16-45 Days, etc.?

Any ideas on how to resolve this?

Any help is appreciated.