The discount name, e.g. you might enter "10% Discount".
When adding line items to an invoice or purchase order, you can
use the name to select the discount and add it as a line item.
Note: When a discount is
added as a
line item on an invoice, the discount applies to the previous
line item only. If you want to apply a discount to a set of line
items, use a Subtotal line item.