I use CEON advanced shipping module and encounter a problem with it. I am looking for another (super)user who knows how to work with the parameters.

My problem is the following:
I configured categories. If item is category A, shipping is $5 and if item is category B shipping is $10. That works fine untill I put both an item for category A & B in my cart. Then he adds the two up and gives a $15 shipping cost, but I want it to be the max of the highest fee, so $10.

How can I do that?