[FIX] ajuste

models/sale.py

@@ -101,8 +101,6 @@ class SaleOrder(osv.Model):
 class SaleOrderLine(osv.Model):
     _inherit = "sale.order.line"
 
-
-
     _columns = {
         'discount': fields.float(string='Discount (%)',digits=(16, 10),default=0.0),
         'discount_amount':fields.float(compute='_discount_line',string='Descuento (Monto)',default=0.0)

views/sale_view.xml

@@ -23,7 +23,7 @@
                 </xpath>
 
                 <xpath expr="//tree[@string='Sales Order Lines']//field[@name='discount']" position="after">
-                    <field name="discount_amount"/>
+                    <field name="discount_amount" readonly="1"/>
                 </xpath>
 
                 <xpath expr="//group[@name='sale_total']" position="replace">