Attribute price impact with multiple combination

[milausj]

Hi, maybe somebody can help me, i use prestashop 1.4.1

why when i use combination with impact 0€ all my combination have impact price 0€?

Example:
1 product, base price 0€
combination 1: paper type 1, size 1: price impact +10€
combination 2: paper type 1, size 2: price impact +20€
combination 3: color red price impact +0€

Why in my product detail combinatio:
paper type 1
size 2
color red
TOTAL 10€ WHY? Must be 20€

Can i use a combination?
combination 2: color red,blu, black, yellow price impact +0€

ATTRIBUTE WIZARD PRO not help me for this problem.

Thanks