When using the 'Least expensive' mix and match discount, retailers would like the discount to be applied proportionately across all the qualifying lines of the discount, instead of just on the least expensive item. The reason for this is so that when an item is returned to the store, the customer receives the correct value back, regardless of which of the lines are being returned. This also prevents fraudulent transactions where a customer may have purchased against a buy two get the cheapest item free offer, then simply return the most expensive item, (resulting in obtaining the other item for free). This would need to be a parameter under the discount parameters in the retail parameters form. The result would be to change the logic under the DistributeLeastExpensive code within the pricing engine for MixAndMatch discounts, so that instead of splitting the value across the number of least expensive lines qty setting, it would split across the mix and match line group 'number of products needed' value.