pos/pos_tare/demo/pos_config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2018 - 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="point_of_sale.pos_config_main" model="pos.config">
        <field name="iface_electronic_scale" eval="1" />
    </record>

</data></openerp>