| Value | Description | Notes | Issue number | Modified in Issue |
|---|---|---|---|---|
| 01 | Rising discount | Discount applied to all units in a qualifying order. The default if no <DiscountType> is specified | 24 | |
| 02 | Rising discount (cumulative) | Additional discount may be applied retrospectively, based on number of units ordered over a specific period | 24 | |
| 03 | Progressive discount | Discount applied to marginal units in a qualifying order | 24 | |
| 04 | Progressive discount (cumulative) | Previous orders within a specific time period are counted when calculating a progressive discount | 24 |