Add product_barcode in SO lines, PO lines, stock move lines and invoice lines with optional="hide"

Show warning about double VAT partner even when not in editable mode

account_usability/views/account_move.xml

@@ -30,6 +30,9 @@
             <field name="matching_number" optional="hide"/>
             <field name="reconcile_string" optional="show"/>
         </xpath>
+        <xpath expr="//field[@name='invoice_line_ids']/tree/field[@name='product_id']" position="after">
+            <field name="product_barcode" optional="hide"/>
+        </xpath>
     </field>
 </record>