Odoo-18.0-20251222/maintenance_request_sequence/data/maintenance_request_data.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo noupdate="1">
    <record id="seq_maintenance_request_auto" model="ir.sequence">
        <field name="name">Maintenance Request Default</field>
        <field name="code">maintenance.request.default</field>
        <field eval="5" name="padding" />
        <field name="prefix">MR</field>
    </record>
</odoo>