--- /dev/null
+++ b/trytond/trytond/modules/stock_supply/view/purchase_configuration_form.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
+this repository contains the full copyright notices and license terms. -->
+<data>
+    <xpath expr="/form/field[@name='purchase_process_after']" position="after">
+       <newline/>
+       <label name="supply_period"/>
+       <field name="supply_period"/>
+    </xpath>
+</data>