pos/pos_to_weight_by_product_uom/demo/uom_category.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017, Grap
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<odoo>

    <record model="uom.category" id="uom_category_to_weigh">
        <field name="name">Demo - New Category To Weigh</field>
        <field name="to_weigh">True</field>
    </record>

</odoo>