How is Assessable value in O2C - shipping and AR tables is calculated ?

Summary:

We implement OM, Pricing and basic O2C process.

With our current setup (Price list + discount list), we noticed that the assessable value calculated in shipment line and receivable lines for a SO, is the amount of line before discount.

Example :

base price = 15, qty = 10, global discount = 20%, the line amount in SO line is 120.and yet in invoice and shipment, the assessable value is 150, ie. the amount before discount.

How is it derived and how can we change the logic in order to take the final amount of the line ?

Version (include the version you are using, if applicable):

Fusion 25B