Management of receivables includes checking whether amounts due are paid on time. If customers have overdue payments, you must decide when and how to send them a reminder. In addition, you may want to debit their accounts for interest and/or fees.
Open the 
Reminder Terms
window.
In the Reminder Terms window, click the line with the terms you want to set up levels for, and then click Levels. The Reminder Levels window appears.
Fill in the various fields. For Help about a specific field, click the field and press F1.
Creating Reminders Automatically