Since https://github.com/odoo/odoo/pull/115222, a new line on an invoice
won't have the default sales tax put on by default. If there are no
taxes on the product, the account or from predictive, the tax will stay
empty. Its use has been restricted back to the tax put on new products.
It is still used in Accounting Firms mode, as we don't want people
to have to input the product when quick encoding.
task-3045026
closesodoo/documentation#4421
Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>
768c2b231b