I am trying to create shopping cart rule: 

* Two or more DIFFERENT products should be added to a cart
* Include Products only from categories "6 & 8"
* Apply 5% discount

![This rule works even if you have one product with QTY >=2, But I need to apply discount only if two different products present in cart](https://i.stack.imgur.com/lDAI6.png)

Any help appreciated.

Thanks