Here's how you can define and use a sequence in Odoo to generate unique identifiers for your records. This approach ensures that each record has a distinct and traceable ID. Sequence numbers are used to generate unique identifiers for records such as orders, invoices, or custom models. They ensure traceability and help maintain order integrity. Define the Sequence in XML (in data/ir_sequence_data.xml) Load Sequence File in __manifest__.py Use the Sequence in Python XML code - Define the Sequence Example Sequence example.model EXM/%(year)s/ 5 1 1 Python code - Use the Sequence in Python class ExampleModel(models.Model): _name = 'example.model' name = fields.Char(string="Reference", required=True, copy=False, readonly=True, default='New') @api.model def create(self, vals): if vals.get('name', 'New') == 'New': vals['name'] = self.env['ir.sequence'].next_by_code('example.model') or 'New' return super(ExampleModel, self).create(vals) Remember to add 'data/ir_sequence_data.xml' to your '__manifest__.py' file under the 'data' key.