/data/sequence.xml
<?xml version='1.0' encoding='utf-8'?>
<odoo>
<data noupdate="1">
<record id="seq_hospital_patient" model="ir.sequence">
<field name="name">Patient Reference</field>
<field name="code">hospital.patient.sequence</field>
<field name="prefix">PN</field>
<field name="padding">3</field>
<field name="company_id" eval="False"/>
</record>
</data>
<data noupdate="1">
<record id="seq_hospital_appointment" model="ir.sequence">
<field name="name">Appointment ID</field>
<field name="code">hospital.appointment.sequence</field>
<field name="prefix"> PA </field>
<field name="padding">3</field>
<field name="company_id" eval="False"/>
</record>
</data>
</odoo>
Sequence has been created and Active
