odoo16/addons/point_of_sale/views/point_of_sale_sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
<data noupdate="1">
    <record id="seq_pos_session" model="ir.sequence">
        <field name="name">POS Session</field>
        <field name="code">pos.session</field>
        <field name="prefix">POS/</field>
        <field name="padding">5</field>
        <field name="company_id" eval="False" />
    </record>
</data>
</odoo>