res_users_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>

    <record id="res_users_form_preference_view" model="ir.ui.view">
        <field name="name">res.users.form.view</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="base.view_users_form_simple_modif" />
        <field name="arch" type="xml">
            <xpath expr="//group[@name='preferences']" position="inside">
                <field name="pos_config" />
            </xpath>
        </field>
    </record>

    <record id="res_users_form_view" model="ir.ui.view">
        <field name="name">res.users.form.view</field>
        <field name="model">res.users</field>
        <field name="inherit_id" ref="base.view_users_form" />
        <field name="arch" type="xml">
            <notebook position="inside">
                <page string="Point of Sale">
                    <group>
                        <field name="pos_config" />
                        <field name="ean13" />
                        <button name="edit_ean" type="object" string="Edit EAN" class="oe_edit_only" />
                    </group>
                </page>
            </notebook>
        </field>
    </record>
    </data>
</openerp>