diff --git a/ext/custom-addons/dp_custom/views/sale_views.xml b/ext/custom-addons/dp_custom/views/sale_views.xml
index 3d85cb26..5b9b2a65 100644
--- a/ext/custom-addons/dp_custom/views/sale_views.xml
+++ b/ext/custom-addons/dp_custom/views/sale_views.xml
@@ -126,6 +126,9 @@
                     attrs="{'readonly': [('qty_invoiced', '>', 0)]}"  options='{"fg_color": "red:price_change" }'/>
             </xpath>
 -->
+            <xpath expr="//field[@name='order_line']/tree//field[@name='discount']" position="replace">
+                <field name="discount" attrs="{'readonly':[('qty_invoiced','&gt;',0)]}"/>
+            </xpath>
             <xpath expr="//field[@name='order_line']/tree//field[@name='price_unit']" position="after">
                 <field name="read_price" options='{"bg_color": "yellow:price_change" }' attrs="{'invisible': False,'readonly':[('from_designbox','=',True)]}"/>
 <!--                <field name="read_price" colors="yellow:price_change==True"/> -->