odoo18/addons_extensions/grace_period/data/sequence.xml

<odoo>

    <record id="seq_late_coming_request"
            model="ir.sequence">

        <field name="name">
            Late Coming Request
        </field>

        <field name="code">
            late.coming.request
        </field>

        <field name="prefix">
            LCR/
        </field>

        <field name="padding">
            5
        </field>

    </record>

</odoo>