[FIX] sale: _get_tax_amount_by_group

The function _get_tax_amount_by_group must take the discount applied
on line when computing the amount of each tax.

opw:692560

addons/sale/models/sale.py

@@ -508,7 +508,7 @@ class SaleOrder(models.Model):
             for tax in line.tax_id:
                 group = tax.tax_group_id
                 res.setdefault(group, 0.0)
-                res[group] += tax.compute_all(line.price_unit, quantity=line.product_uom_qty)['taxes'][0]['amount']
+                res[group] += tax.compute_all(line.price_reduce, quantity=line.product_uom_qty)['taxes'][0]['amount']
         res = sorted(res.items(), key=lambda l: l[0].sequence)
         res = map(lambda l: (l[0].name, formatLang(self.env, l[1], currency_obj=currency)), res)
         return res