pos/pos_pricelist/templates/assets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 Tecnativa - Jairo Llopis
     License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl). -->

<odoo>
    <template id="assets" inherit_id="point_of_sale.assets">
        <xpath expr=".">
            <script
                type="text/javascript"
                src="/pos_pricelist/static/src/js/models.js"/>
            <script
                type="text/javascript"
                src="/pos_pricelist/static/src/js/screens.js"/>
        </xpath>
    </template>
</odoo>