Coupon order

This is a pre-sales question of the pro version.

I tried the demo version of pro, I realized, that I multiple discounts are calculated errorneously. I suppose, that your premium plugin can be handle this issue with the proper settings?

Test case:
There were two items in the cart:
producat A $20
product B $5
There was two discounts:

1. ?a fixed price discount for product B which was? $5.
2. a cart discount of 10%,
   

After the first discount applied the cart subtotal should be $ 20. Instead your plugin calclulated a subtotal of $25.

Consequently, the cart discount was wrong. The correct cart discount should have be $20 *0.*=$18. Your program calculated from the wrong subtotal:  $25 * 0.9 =$20

I suppose, that this can be change in a way, but I could not find it yet. I need your help, how to set the order of the coupons applied.