Discounts - find best, rather than combine all

[Ross.Nospario]

Is there a means to change multiple discount rules (for example, both a group-based category discount and a product-specific price rule) so that the price shown is the better discount, rather than the combined discount of all rules?

 

I need to replicate the discount structure of Orderwise, which searches for the best price out of multiple discount rulings.

 

Quick example:

 

Customer is in group ABC, which receives a 10% discount.

The chosen product for this customer provides a 20% discount.

Prestashop currently applies a 30% discount, but I need it to instead work out which is the best price... which would be a 20% discount in this case.