diff --git a/product_code_unique/README.rst b/product_code_unique/README.rst
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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+
+==================================
+Unique Product Internal Reference
+==================================
+
+This module adds a constraint on the internal reference of the product 
+to make it unique across the database.
+
+Usage
+=====
+
+* For this module to be succesfully installed, there should be no 2 existing 
+records that has the same Internal Reference including empty fields. A 
+correction of the records needs to be done prior to the installation of this
+module.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/OCA/product-attribute/issues>`_. In case of trouble, please
+check there if your issue has already been reported. If you spotted it first,
+help us smash it by providing detailed and welcomed feedback.
+
+Credits
+=======
+
+Images
+------
+
+* Odoo Community Association: `Icon <https://github.com/OCA/maintainer-tools/blob/master/template/module/static/description/icon.svg>`_.
+
+Contributors
+------------
+
+* Antonio Yamuta <ayamuta@opensourceintegrators.com>
+
+Funders
+-------
+
+The development of this module has been financially supported by:
+
+* Open Source Integrators <http://www.opensourceintegrators.com>
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+    :alt: Odoo Community Association
+    :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.
diff --git a/product_code_unique/__init__.py b/product_code_unique/__init__.py
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+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import models
diff --git a/product_code_unique/__manifest__.py b/product_code_unique/__manifest__.py
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+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Unique Product Internal Reference",
+    "summary": "Set Product Internal Reference as Unique",
+    "version": "11.0.1.0.0",
+    "license": "AGPL-3",
+    "author": "Open Source Integrators, Odoo Community Association (OCA)",
+    "category": "Product",
+    "website": "http://www.opensourceintegrators.com",
+    "depends": ["product"],
+    "data": [
+    ],
+    'demo': [
+        'data/product_demo.xml',
+    ],
+    "installable": True,
+}
diff --git a/product_code_unique/data/product_demo.xml b/product_code_unique/data/product_demo.xml
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+<?xml version="1.0"?>
+<odoo>
+    <record id="product.product_product_1" model="product.product">
+        <field name="name">GAP Analysis Service</field>
+        <field name="default_code">GAPANA</field>            
+    </record>
+    <record id="product.product_product_2" model="product.product">
+        <field name="name">Support Services</field>
+        <field name="default_code">SUSER</field>         
+    </record>
+    <record id="product.product_product_5c" model="product.product">
+        <field name="name">Parts Replacement</field>
+        <field name="default_code">PAREP</field>                 
+    </record>
+    <record id="product.product_product_6c" model="product.product">
+        <field name="name">Repair</field>
+        <field name="default_code">REP</field>                 
+    </record>
+    <record id="product.product_product_11c" model="product.product">
+        <field name="name">Cleaning</field>
+        <field name="default_code">CLEN</field>         
+        </record>
+    <record id="stock.test_quant_product" model="product.product">
+        <field name="name">Whiteboard</field>
+        <field name="default_code">WTBO</field>         
+    </record>     
+    <!-- Archived Demo Products without Internal Reference Value -->
+    <record id="product.membership_0" model="product.product">
+        <field name="name">Gold Membership</field>
+        <field name="default_code">GMEM</field>
+    </record>
+    <record id="product.membership_1" model="product.product">
+        <field name="name">Silver Membership</field>
+        <field name="default_code">SMEM</field>
+    </record>
+    <record id="product.membership_2" model="product.product">
+        <field name="name">Basic Membership</field>
+        <field name="default_code">BMEM</field>
+    </record>
+</odoo>
diff --git a/product_code_unique/models/__init__.py b/product_code_unique/models/__init__.py
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+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import product
diff --git a/product_code_unique/models/product.py b/product_code_unique/models/product.py
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+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    default_code = fields.Char('Internal Reference', index=True)
+
+    _sql_constraints = [
+        ('product_template_default_code_uniq', 'unique(default_code)',
+            'Internal Reference must be unique across the database!')]
+
+
+class ProductProduct(models.Model):
+    _inherit = 'product.product'
+
+    default_code = fields.Char('Internal Reference', index=True)
+
+    _sql_constraints = [
+        ('product_product_default_code_uniq', 'unique(default_code)',
+            'Internal Reference must be unique across the database!')]
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