Odoo-Tutorial/academy_management/data/ir_sequence_data.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo noupdate="1">

    <record id="sequence_course_code" model="ir.sequence">
        <field name="name">Academy Course Code</field>
        <field name="code">academy.course</field>
        <field name="prefix">CNTT</field>
        <field name="padding">3</field>
        <field name="number_next">1</field>
        <field name="number_increment">1</field>
    </record>

    <record id="sequence_student_code" model="ir.sequence">
        <field name="name">Academy Student Code</field>
        <field name="code">academy.student</field>
        <field name="prefix">SV</field>
        <field name="padding">3</field>
        <field name="number_next">1</field>
        <field name="number_increment">1</field>
    </record>

     <record id="sequence_teacher_code" model="ir.sequence">
        <field name="name">Academy Teacher Code</field>
        <field name="code">academy.teacher</field>
        <field name="prefix">GV</field>
        <field name="padding">3</field>
        <field name="number_next">1</field>
        <field name="number_increment">1</field>
    </record>

</odoo>