diff --git a/addons/purchase/purchase_view.xml b/addons/purchase/purchase_view.xml
index 66c66e024bd..7ca3fb1055c 100644
--- a/addons/purchase/purchase_view.xml
+++ b/addons/purchase/purchase_view.xml
@@ -644,12 +644,12 @@
             <field name="model">product.product</field>
             <field name="inherit_id" ref="account.product_normal_form_view"/>
             <field name="arch" type="xml">
-                <field name="property_account_expense" position="replace" >
+                <xpath expr="//field[@name='property_account_expense']" position="replace" >
                      <field name="property_account_expense" domain="[('type','&lt;&gt;','view'),('type','&lt;&gt;','consolidation')]" attrs="{'readonly':[('purchase_ok','=',0)]}" />
-                </field>
-                <field name="supplier_taxes_id" position="replace" >
+                </xpath>
+                <xpath expr="//field[@name='supplier_taxes_id']" position="replace" >
                      <field name="supplier_taxes_id" colspan="2" widget="many2many_tags" attrs="{'readonly':[('purchase_ok','=',0)]}"/>
-                </field>
+                </xpath>
             </field>
         </record>