diff --git a/addons/purchase/views/product_views.xml b/addons/purchase/views/product_views.xml
index a1f5f212581..d51b0f30ace 100644
--- a/addons/purchase/views/product_views.xml
+++ b/addons/purchase/views/product_views.xml
@@ -25,6 +25,9 @@
                 <xpath expr="//field[@name='product_id']" position="attributes">
                     <attribute name="readonly">0</attribute>
                 </xpath>
+                <xpath expr="//field[@name='delay']" position="attributes">
+                    <attribute name="optional">show</attribute>
+                </xpath>
             </field>
         </record>