sequence.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2022 Agus Gustiana <aa.gustiana@gmail.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

<odoo>
  <data noupdate="1">

    <!-- Sequences for Incoming Letter -->

    <record id="seq_in_idg_letter" model="ir.sequence">
      <field name="name">IDG Incoming Letter</field>
      <field name="code">in.idg.letter</field>
      <field name="prefix">IN/%(year)s/%(month)s/%(day)s/</field>
      <field name="padding">3</field>
    </record>

    <!-- Sequences for Outgoing Letter -->

    <record id="seq_out_idg_letter" model="ir.sequence">
      <field name="name">IDG Outgoing Letter</field>
      <field name="code">out.idg.letter</field>
      <field name="prefix">OUT/%(year)s/%(month)s/%(day)s/</field>
      <field name="padding">3</field>
    </record>

  </data>
</odoo>