Hi,

The best way is to configure an Odoo Sequence and link it to the default_code (internal reference) or barcode.

Sample Code:

Data file for sequence:

<odoo>

    <!-- Sequence definition for product internal reference -->

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

        <field name="name">Product Internal Reference</field>

        <field name="code">product.default.code</field>

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

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

        <field name="number_next">1</field>

        <field name="number_increment">1</field>

        <field name="company_id" eval="False"/>

    </record>

</odoo>

Python:

from odoo import api, fields, models

class ProductTemplate(models.Model):

    _inherit = "product.template"

    @api.model_create_multi

    def create(self, vals_list):

        for vals in vals_list:

            if not vals.get("default_code"):

                vals["default_code"] = self.env["ir.sequence"].next_by_code(

                    "product.default.code"

                )

        return super().create(vals_list)

Result:

internal reference = PROD/00001

Hope it helps

Hi,

1. Custom barcode/label – The standard Odoo label only shows a few fields. To add size, weight, type, company, MRP, wholesale price, or even a product image, you’ll need to customize the report template (report.product_template_label). This can be done with Studio (adding extra fields in the QWeb template) or with a small custom module if you want full control of the design.
2. Automatic product codes – You don’t need to enter barcodes or internal references manually. You can set up a sequence so Odoo generates a unique code for every new product. In developer mode go to Technical → Sequences & Identifiers, create a sequence, and assign it to the product default_code (internal reference) or barcode field. With that, each new product gets a unique code automatically.

So: label customization = template change, unique codes = sequence.

Hope this helps!