odoo16/addons/l10n_co_pos/views/res_config_settings_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <record id="res_config_settings_view_form" model="ir.ui.view">
        <field name="name">res.config.settings.view.form.inherit.l10n_co_pos</field>
        <field name="model">res.config.settings</field>
        <field name="inherit_id" ref="point_of_sale.res_config_settings_view_form"/>
        <field name="arch" type="xml">
            <xpath expr="//div[@id='order_reference']" position="attributes">
                <attribute name="groups"></attribute>
            </xpath>
            <xpath expr="//field[@name='pos_sequence_id']" position="attributes">
                <attribute name="readonly">0</attribute>
            </xpath>
        </field>
    </record>

</odoo>