The return tax should only be used through its parent tax, we don't want it to be accessible directly on bills or invoices. opw-3347425 (2nd issue) closes odoo/odoo#126803 X-original-commit: a87bb033a3b02bf91f0958e8ee8a5202b297cd68 Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com> Signed-off-by: Claire Bretton (clbr) <clbr@odoo.com>