Hi Vito,
Im sorry about it.
We can use it even in a normal sales order scenario.
Please find below the screen print wherein - the Campaign Code is being assigned to the "Camp./TP" field:
By this assignment of Camapign Code, thediscount maintained in the campign for the product would get automatically calculated as shown in the below screen print:
Please let me know if still you are to able to relate / stuck in simulating the scenario.
Regards