I want to add a field after Barcode.

So, i create a field :

Field Name :x_millesime

Model : Product

Field Label : Millesime

Field Help

Field Type : integer 

After this, i duplicate product.product.form

View Name : vin product.product.form

View Type : Form

Object : product.product

Inherited View : product.product.form 

architecture :

<?xml version="1.0"?>

<xpath expr="//field[@name='barcode']" position="after">

<field name="x_millesime" />

</xpath>

But the field doesn't appear in inventory->product   ....:/