server-tools/base_external_system/demo/external_system_os_demo.xml

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

<!--
    Copyright 2017 LasLabs Inc.
    License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl).
-->

<odoo>

    <record id="external_system_os" model="external.system.os">
        <field name="name">Example OS Connection</field>
        <field name="system_type">external.system.os</field>
        <field name="remote_path">/tmp</field>
        <field name="company_ids" eval="[(5, 0), (4, ref('base.main_company'))]" />
    </record>

</odoo>