I'm looking for a module that apply the highest discount if there is for each sale order line, for example if there are more than a promotion program applied on the same product in the sale order lines, it should apply only one the highest discount, this should work in sales and point of sales too, same for coupon, if a coupon is added and it has the highest discount for that product than it has to be the one to keep if it is not higher than the existing discount lines than it should not be added, this should work in Sales and POS.

Thank you in advance.