Regarding about the Quantity discount
Base on the example buy two get one free... I found that if i add more than three or more item the value is equal to zero,
Item1 = 15
Item2 = 15
Item3 = 0
the 4th item/5th item should have a price and for the 6th item should be discounted,
Item4 = 15
Item5 = 15
Item6 = 0
repeatedly and so on....
The logic is number of item split by number of given quantity.
The promo must have an option like limit to (1,2,3...) set only or unlimited set.
Hoping that you've got my idea.
AdminDeveloper (Developer, W&O POS) commented
You are right. We will fix it in the coming version