product_ean_duplicates/views/view_product_product.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2015-Today GRAP (http://www.grap.coop)
@author: Sylvain LE GAL (https://twitter.com/legalsylvain)
License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 -->
<openerp><data>

    <record id="view_product_ean_duplicates" model="ir.ui.view">
        <field name="model">product.product</field>
        <field name="arch" type="xml">
            <tree editable="bottom">
                <field name="name"/>
                <field name="ean13"/>
                <field name="ean_duplicates_qty"/>
                <field name="company_id" groups="base.group_multi_company"/>
            </tree>
        </field>
    </record>

    <record id="view_product_product_search" model="ir.ui.view">
        <field name="model">product.product</field>
        <field name="inherit_id" ref="product.product_search_form_view"/>
        <field name="arch" type="xml">
            <filter name="filter_to_sell" position="after">
                <separator/>
                <filter string="EAN Duplicates" name="ean_duplicates" domain="[('ean_duplicates_exist', '=', True)]"/>
            </filter>
        </field>
    </record>

</data></openerp>