Car configurator sample - How to represent incompatible

Question

Hi,

I am trying to customize the car configurator sample.  If I want to ensure compatibility of the  car Engine - V8 , Car Model - starter  and Car Package - Comfort I can add a constraint like

 (CarEngine =="V8" &  CarModel == "starter"   & CarPackage == "comfort"    )

What if I want to make sure that the combination (V8,starter, comfort) should not exisit.

What constraint should I give ?  Any idea ?

Answer 1

Negate the constraint. 

 !(CarEngine =="V8" &  CarModel == "starter"   & CarPackage == "comfort"    )

Not(CarEngine =="V8" &  CarModel == "starter"   & CarPackage == "comfort" )