OCA · miquelrosell99 · Jul 31, 2026
diff --git a/document_page_reference/README.rst b/document_page_reference/README.rst
@@ -1,7 +1,3 @@
-.. image:: https://odoo-community.org/readme-banner-image
-   :target: https://odoo-community.org/get-involved?utm_source=readme
-   :alt: Odoo Community Association
-
 =======================
 Document Page Reference
 =======================
@@ -17,7 +13,7 @@ Document Page Reference
 .. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
     :target: https://odoo-community.org/page/development-status
     :alt: Beta
-.. |badge2| image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
     :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
     :alt: License: AGPL-3
 .. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fknowledge-lightgray.png?logo=github

diff --git a/document_page_reference/__manifest__.py b/document_page_reference/__manifest__.py
@@ -5,7 +5,7 @@
     "name": "Document Page Reference",
     "summary": """
         Include references on document pages""",
-    "version": "18.0.2.1.3",
+    "version": "18.0.2.1.4",
     "license": "AGPL-3",
     "author": "Creu Blanca,Odoo Community Association (OCA)",
     "website": "https://github.com/OCA/knowledge",

diff --git a/document_page_reference/migrations/18.0.2.1.4/pre-migrate.py b/document_page_reference/migrations/18.0.2.1.4/pre-migrate.py
@@ -0,0 +1,29 @@
+# Copyright 2026 GMI Fabrica
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """Clear duplicate references before adding the DB unique constraint.
+
+    The oldest record of each duplicated reference keeps its value; the rest
+    are left without a reference.
+    """
+    openupgrade.logged_query(
+        env.cr,
+        """
+        WITH duplicates AS (
+            SELECT id,
+                   ROW_NUMBER() OVER (
+                       PARTITION BY reference ORDER BY id
+                   ) AS rn
+            FROM document_page
+            WHERE reference IS NOT NULL
+        )
+        UPDATE document_page dp
+        SET reference = NULL
+        WHERE id IN (SELECT id FROM duplicates WHERE rn > 1)
+        """,
+    )
diff --git a/document_page_reference/models/document_page.py b/document_page_reference/models/document_page.py
@@ -16,12 +16,21 @@ class DocumentPage(models.Model):
     _description = "Document Page"
 
     reference = fields.Char(
-        help="Used to find the document, it can contain letters, numbers and _"
+        copy=False,
+        help="Used to find the document, it can contain letters, numbers and _",
     )
     content_parsed = fields.Html(
         "Parsed Content", compute="_compute_content_parsed", sanitize=False, store=True
     )
 
+    _sql_constraints = [
+        (
+            "document_page_reference_unique",
+            "UNIQUE(reference)",
+            "The reference must be unique.",
+        )
+    ]
+
     def get_formview_action(self, access_uid=None):
         res = super().get_formview_action(access_uid)
         view_id = self.env.ref("document_page.view_wiki_form").id

diff --git a/document_page_reference/static/description/index.html b/document_page_reference/static/description/index.html
@@ -3,7 +3,7 @@
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="generator" content="Docutils: https://docutils.sourceforge.io/" />
-<title>README.rst</title>
+<title>Document Page Reference</title>
 <style type="text/css">
 
 /*
@@ -360,21 +360,16 @@
 </style>
 </head>
 <body>
-<div class="document">
+<div class="document" id="document-page-reference">
+<h1 class="title">Document Page Reference</h1>
 
-
-<a class="reference external image-reference" href="https://odoo-community.org/get-involved?utm_source=readme">
-<img alt="Odoo Community Association" src="https://odoo-community.org/readme-banner-image" />
-</a>
-<div class="section" id="document-page-reference">
-<h1>Document Page Reference</h1>
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! This file is generated by oca-gen-addon-readme !!
 !! changes will be overwritten.                   !!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! source digest: sha256:7ae4eea4b6e7501b923f3597e005c064c4b58658b2913d8c3bfd25b1a7f9494c
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
-<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/license-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/knowledge/tree/18.0/document_page_reference"><img alt="OCA/knowledge" src="https://img.shields.io/badge/github-OCA%2Fknowledge-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/knowledge-18-0/knowledge-18-0-document_page_reference"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/knowledge&amp;target_branch=18.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
+<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/knowledge/tree/18.0/document_page_reference"><img alt="OCA/knowledge" src="https://img.shields.io/badge/github-OCA%2Fknowledge-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/knowledge-18-0/knowledge-18-0-document_page_reference"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/knowledge&amp;target_branch=18.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
 <p>This module allows to add a reference name on documents and simplifies
 the link between document pages.</p>
 <p><strong>Table of contents</strong></p>
@@ -391,35 +386,35 @@ <h1>Document Page Reference</h1>
 </ul>
 </div>
 <div class="section" id="usage">
-<h2><a class="toc-backref" href="#toc-entry-1">Usage</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
 <p>When editing a document page add elements like {{XXX}} where XXX is the
 reference of another page. Now, when viewing the document, it will link
 directly to the page. Also, the name will be parsed as the display name.</p>
 </div>
 <div class="section" id="bug-tracker">
-<h2><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h1>
 <p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/knowledge/issues">GitHub Issues</a>.
 In case of trouble, please check there if your issue has already been reported.
 If you spotted it first, help us to smash it by providing a detailed and welcomed
 <a class="reference external" href="https://github.com/OCA/knowledge/issues/new?body=module:%20document_page_reference%0Aversion:%2018.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
 <p>Do not contact contributors directly about support or help with technical issues.</p>
 </div>
 <div class="section" id="credits">
-<h2><a class="toc-backref" href="#toc-entry-3">Credits</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-3">Credits</a></h1>
 <div class="section" id="authors">
-<h3><a class="toc-backref" href="#toc-entry-4">Authors</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-4">Authors</a></h2>
 <ul class="simple">
 <li>Creu Blanca</li>
 </ul>
 </div>
 <div class="section" id="contributors">
-<h3><a class="toc-backref" href="#toc-entry-5">Contributors</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-5">Contributors</a></h2>
 <ul class="simple">
 <li>Enric Tobella &lt;<a class="reference external" href="mailto:etobella&#64;creublanca.es">etobella&#64;creublanca.es</a>&gt;</li>
 </ul>
 </div>
 <div class="section" id="maintainers">
-<h3><a class="toc-backref" href="#toc-entry-6">Maintainers</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-6">Maintainers</a></h2>
 <p>This module is maintained by the OCA.</p>
 <a class="reference external image-reference" href="https://odoo-community.org">
 <img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" />
@@ -434,6 +429,5 @@ <h3><a class="toc-backref" href="#toc-entry-6">Maintainers</a></h3>
 </div>
 </div>
 </div>
-</div>
 </body>
 </html>
diff --git a/document_page_reference/tests/test_document_reference.py b/document_page_reference/tests/test_document_reference.py
@@ -59,6 +59,13 @@ def test_auto_reference(self):
             )
             self.assertFalse(new_page_duplicated_name.reference)
 
+    def test_duplicate_page_clears_reference(self):
+        """Duplicating a page must not reuse the original reference."""
+        new_page = self.page1.copy()
+        self.assertNotEqual(new_page.reference, self.page1.reference)
+        self.assertTrue(new_page.reference)
+        self.assertIn("copy", new_page.reference)
+
     def test_get_formview_action(self):
         res = self.page1.get_formview_action()
         view_id = self.env.ref("document_page.view_wiki_form").id