How to change the tax calculation in the "Purchase price" field. Since I use the "purchase price" without tax, but when I add an item through your "purchase order" module, I see the wrong price without tax (more precisely, it is correct if the tax is not applied), but I need the price without tax to be indicated by the value that I set in the "Purchase price" field.
Is it possible to disable the tax from the "Purchase price"? And if not. can you add this feature?
