pos/pos_barcode_tare/demo/pos_barcode_tare_demo.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="product_uom_kgm_dbg" model="uom.uom">
        <field name="category_id" ref="uom.product_uom_categ_kgm"/>
        <field name="name">Kg</field>
        <field name="factor" eval="1"/>
        <field name="rounding" eval="0.001"/>
        <field name="uom_type">bigger</field>
    </record>
</odoo>