RPO - Use cases for UOM/EUOM constraints

Hi,

I'm trying to understand and create a helpful example on how to use the UOM and EUOM constraints, but I'm having some hard time to deeply understand the mechanics behind it by only looking the Oracle Guides.

So far, from what I understood, these constraints can be used like the following example (I'm using metric system):

Let's say we have the following items:

Price per unit is calculated as Price / UOM, and Price per liter is Price / EUOM.

From that, we can derive 2 constraints in RPO:

Constraint 1 - Coca-cola 350ml 6-Pack (item 2) should be 10% cheaper than Coca-cola 350ml (item 1)