Unfortunately my coupons stopped working and I am in a middle of a big campaign which relies on the offer granted through the coupons. The changes consumed a lot of time and it is very hard to revert them...
I tried adding the child products in a category and apply the coupon there but the problem was not resolved.
seyi, I am sending you a PM with access credentials and I hope you will be able to solve this soon.
Thank you very much in advance.