I need to make a discount rule that only applies if products of Categories 2 & 5 are combined, and not applies if one of them is alone in the shopping cart
so seperated: product from cat. 2 = €10 product from cat. 6 = €15
both combined are (€10+€15)- discount(20%) = €20 but if there is a product from cat 3 & 6 then there will be no discount.
hope this explains my problem