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In CubeCart 520, a feature was added that allowed for a coupon to optionally and explicitly include or exclude products from it discounting the subtotal of the shopping cart. However, a bug exists (bug #597). If a shopping basket contains only the one item "Widget", and a coupon is used that explicitly excludes "Widget", CubeCart will still apply the discount that this coupon provides. (More experiments are needed to verify, but I think that if there is also something else, like "Doodad", in the shopping basket, this bug does not happen.) Bug 597 has been reported as Resolved. (And maybe, if you email CubeCart Sales and ask for the fix, they may send it to you, but if not...) If you need an experimental fix now, so that your store can offer discounts in time for the next major holiday, try these edits in the following posts (soon to be posted). Here are some parameters I found while going through the code: * only one coupon can be added by the customer per order (future fix) * that coupon can apply to the sub-total of eligible products, or to the shipping, but not both * the coupon applies to the line-item subtotal, whatever that may be (e.g., sale price, quantity point price, options price) * the coupon's number of uses is not handled correctly (bug) * there is no rejection of an excluding coupon even if that coupon cannot be applied to some other product (bug) * there is no capability to offer a coupon based on options of a product, that is, 20% off Large size only (future feature)