diff --git a/configuration.xml b/configuration.xml
index 92b103500c..9392ac7ac9 100644
--- a/configuration.xml
+++ b/configuration.xml
@@ -50,8 +50,8 @@ this repository contains the full copyright notices and license terms. -->
             <field name="group" ref="group_purchase_admin"/>
             <field name="perm_read" eval="True"/>
             <field name="perm_write" eval="True"/>
-            <field name="perm_create" eval="True"/>
-            <field name="perm_delete" eval="True"/>
+            <field name="perm_create" eval="False"/>
+            <field name="perm_delete" eval="False"/>
         </record>
     </data>
 </tryton>