This graph is called Payables by Aging Period if Sage Simply Accounting is set to use accounting terminology.
Unpaid Purchases by Aging Period is a pie chart showing the total amounts you owe your vendors for the current period and three aging periods as well as the percentage of the total that each period represents.
Use it to see a quick overview of the proportion of your purchase invoices due in each period, to find out whether you are paying most of your bills on time.
Display and print the Unpaid Purchases by Aging Period graph