When I want to refund a customer and that I edit a credit slip, the amount of the credit slip is the price of the product, without taking care of any reduction or voucher that the customer might have used to buy this product.
For example, a customer has ordered a shirt for 56 € and has used a voucher (referral program) to earn 10%, so the price paid by this customer is 50,4 €. When I create the credit slip, the amount of the credit is 56 €. I know you can change the amount in the cart rules but it's disturbing and the order slip file is then wrong.
It was working fine on prestashop 1.4 and since I've updated the website with last stable version, I got this issue on several credit slips.