Coupon calculation with discount

[kuldeep]

HI I am new in PrestaShop 1.6.

I have a problem that I want to change.

when I am adding a discount on PrestaShop it's working fine. but when I add percentage coupon it does work after calculating the main discount.

I want it should be calculated with main discount.

Like: discount is 10%.

and coupon discount is: 5%.

so. it's calculating first 10% then 5% on discounted price.

but I want it like this. 15%.

 

Please help..