diff --git a/openerp/addons/base/ir/ir.xml b/openerp/addons/base/ir/ir.xml
index 2792259773d..79490542b1c 100644
--- a/openerp/addons/base/ir/ir.xml
+++ b/openerp/addons/base/ir/ir.xml
@@ -176,6 +176,7 @@
                         <field name="padding"/>
                         <field name="number_increment"/>
                         <field name="number_next"/>
+                        <field name="implementation"/>
                         <separator colspan="4" string="Legend (for prefix, suffix)"/>
                         <group col="8" colspan="4">
                             <group>
@@ -215,6 +216,7 @@
                     <field name="company_id" groups="base.group_multi_company"/>
                     <field name="number_next"/>
                     <field name="number_increment"/>
+                    <field name="implementation"/>
                 </tree>
             </field>
         </record>