Currently VAT handling is not configured in the standard OSOE class configuration of ERP5.
Automatic VAT handling is already an advanced topic, we are still discussing if it is inside the scope of OSOE class HowTo tutorials and if the scope should be for students to learn how to configure ERP5 for VAT handling or for students to use a standard VAT configuration. However, the concepts for handling Taxes and discounts using base application and base contribution in trade conditions are already covered in the theory presentations.