This article explains how to see the old debt from your customer's invoices and bills.
I. Create Sales / Purchasing Through Sell or Buy
Step 1. Select Contact then create a transaction using Later Payment
Step 2. Set the Days Due then 'OK'
II. Invoice Aging Report Through Debt Menu
Step 1. Select more menu property then click on report invoice aging
Step 2. Invoice & Bill Aging Report
*Note: If you have a debt to the Supplier with a due date, you can look at Debt -> More menu -> Bill Aging