diff --git a/addons/purchase/views/purchase_views.xml b/addons/purchase/views/purchase_views.xml
index c1d351e4704..6d6080e1edf 100644
--- a/addons/purchase/views/purchase_views.xml
+++ b/addons/purchase/views/purchase_views.xml
@@ -264,7 +264,7 @@
                                 <group>
                                     <label for="date_planned"/>
                                     <div>
-                                        <field name="date_planned" required="1" attrs="{'readonly': [('state', 'not in', ('draft', 'sent'))]}"/>
+                                        <field name="date_planned" attrs="{'readonly': [('state', 'not in', ('draft', 'sent'))]}"/>
                                         <button name="action_set_date_planned" type="object"
                                             states="draft,sent"
                                             string="Set date to all order lines"