diff --git a/event_registration_partner_unique/README.rst b/event_registration_partner_unique/README.rst
new file mode 100644
index 000000000..9a422428b
--- /dev/null
+++ b/event_registration_partner_unique/README.rst
@@ -0,0 +1,123 @@
+========================
+Unique Partner per Event
+========================
+
+..
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ !! This file is generated by oca-gen-addon-readme !!
+ !! changes will be overwritten. !!
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ !! source digest: sha256:bb5a0d6ae344dc2e6b76d359cc79a72e0c7c0b5e037723344c5d76cc2ffcace7
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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/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%2Fevent-lightgray.png?logo=github
+ :target: https://github.com/OCA/event/tree/18.0/event_registration_partner_unique
+ :alt: OCA/event
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+ :target: https://translation.odoo-community.org/projects/event-18-0/event-18-0-event_registration_partner_unique
+ :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runboat-Try%20me-875A7B.png
+ :target: https://runboat.odoo-community.org/builds?repo=OCA/event&target_branch=18.0
+ :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module is intended for backend use only, and extends the
+functionality of events to avoid duplicating attendees.
+
+It is designed to work alongside *partner_event* (which is a
+dependency), and it is advisable to enable it by clicking on **Create
+Partners in registration**; this way it will create new partners or will
+match existing ones, but at the same time will avoid creating duplicates
+from partners already existing.
+
+**Table of contents**
+
+.. contents::
+ :local:
+
+Usage
+=====
+
+1. Go to **Events** and choose an event or create a new one.
+2. Enable **Forbid Duplicates**.
+3. Go to **Attendees**.
+4. Create a new attendee.
+5. If you try to fill successive attendees with the same contact filled
+ out in the "Attendee Partner" field, the system won't allow it. That
+ can happen for example if the same email is used several times.
+
+Known issues / Roadmap
+======================
+
+- This module is intended for backend use, so the validation error is
+ enough to show the user what is wrong,
+- When *website_event* is installed, and public users try to register
+ more than one attendee, this will trigger a validation error as the
+ attendee partner is duplicated. The error shown is 500 internal server
+ error.
+- It would be necessary to have a new module which depends on
+ *website_event* plus this one to prevent said issue.
+- Another problem would arise when used with *event_sale* module,
+ because it would try to use "Sale Order" contact as attendee and that
+ will lead to the issue of duplicated attendees if trying to buy access
+ to the same event more than once.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/event/issues>`_.
+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
+`feedback <https://github.com/OCA/event/issues/new?body=module:%20event_registration_partner_unique%0Aversion:%2018.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* Tecnativa
+
+Contributors
+------------
+
+- `Tecnativa <https://www.tecnativa.com>`__
+
+ - Rafael Blasco
+ - Jairo Llopis
+ - Vicent Cubells
+ - Cristina Martin R.
+ - Victor M.M. Torres
+ - Víctor Martínez
+ - Carolina Fernandez
+ - Juan José Seguí
+
+- `Heliconia Solutions Pvt. Ltd. <https://www.heliconia.io>`__
+
+ - Bhavesh Heliconia
+
+Maintainers
+-----------
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+ :alt: Odoo Community Association
+ :target: https://odoo-community.org
+
+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.
+
+This module is part of the `OCA/event <https://github.com/OCA/event/tree/18.0/event_registration_partner_unique>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.
diff --git a/event_registration_partner_unique/__init__.py b/event_registration_partner_unique/__init__.py
new file mode 100644
index 000000000..83e553ac4
--- /dev/null
+++ b/event_registration_partner_unique/__init__.py
@@ -0,0 +1,3 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import models
diff --git a/event_registration_partner_unique/__manifest__.py b/event_registration_partner_unique/__manifest__.py
new file mode 100644
index 000000000..35fde1d3f
--- /dev/null
+++ b/event_registration_partner_unique/__manifest__.py
@@ -0,0 +1,19 @@
+# Copyright 2016 Tecnativa - Jairo Llopis
+# Copyright 2017 Tecnativa - Vicent Cubells
+# Copyright 2018 Tecnativa - Cristina Martin R.
+# Copyright 2020 Tecnativa - Víctor Martínez
+# Copyright 2023 Tecnativa - Carolina Fernandez
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+ "name": "Unique Partner per Event",
+ "summary": "Enforces 1 registration per partner and event",
+ "version": "18.0.1.0.0",
+ "category": "Marketing",
+ "website": "https://github.com/OCA/event",
+ "author": "Tecnativa, Odoo Community Association (OCA)",
+ "license": "AGPL-3",
+ "application": False,
+ "installable": True,
+ "depends": ["event", "partner_event"],
+ "data": ["views/event_event_view.xml"],
+}
diff --git a/event_registration_partner_unique/i18n/ca.po b/event_registration_partner_unique/i18n/ca.po
new file mode 100644
index 000000000..e87abc52e
--- /dev/null
+++ b/event_registration_partner_unique/i18n/ca.po
@@ -0,0 +1,47 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# * event_registration_partner_unique
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"PO-Revision-Date: 2023-11-18 20:35+0000\n"
+"Last-Translator: pere-aquarian <pere@aquarian.tech>\n"
+"Language-Team: none\n"
+"Language: ca\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: nplurals=2; plural=n != 1;\n"
+"X-Generator: Weblate 4.17\n"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,help:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid ""
+"Check this to disallow duplicate attendees in this event's registrations"
+msgstr ""
+"Marqueu-ho per no permetre els assistents duplicats en les inscripcions "
+"d'aquest esdeveniment"
+
+#. module: event_registration_partner_unique
+#. odoo-python
+#: code:addons/event_registration_partner_unique/models/event.py:0
+#, python-format
+msgid "Duplicated partners found in event {0}: {1}."
+msgstr "S'han trobat contactes duplicats a l'esdeveniment {0}: {1}."
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_event
+msgid "Event"
+msgstr "Esdeveniment"
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_registration
+msgid "Event Registration"
+msgstr "Registre d'esdeveniment"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,field_description:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid "Forbid Duplicates"
+msgstr "Prohibir duplicats"
diff --git a/event_registration_partner_unique/i18n/es.po b/event_registration_partner_unique/i18n/es.po
new file mode 100644
index 000000000..ef7f65113
--- /dev/null
+++ b/event_registration_partner_unique/i18n/es.po
@@ -0,0 +1,48 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# * event_registration_partner_unique
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 8.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2016-03-07 18:44+0100\n"
+"PO-Revision-Date: 2021-03-17 14:45+0000\n"
+"Last-Translator: Ana Suárez <ana.suarez@qubiq.es>\n"
+"Language-Team: \n"
+"Language: es\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=n != 1;\n"
+"X-Generator: Weblate 4.3.2\n"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,help:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid ""
+"Check this to disallow duplicate attendees in this event's registrations"
+msgstr ""
+"Marque esto para impedir que haya asistentes duplicados en los registrados a "
+"este evento"
+
+#. module: event_registration_partner_unique
+#. odoo-python
+#: code:addons/event_registration_partner_unique/models/event.py:0
+#, python-format
+msgid "Duplicated partners found in event {0}: {1}."
+msgstr "Empresas duplicadas encontradas en el evento {0}: {1}."
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_event
+msgid "Event"
+msgstr "Evento"
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_registration
+msgid "Event Registration"
+msgstr "Registro del evento"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,field_description:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid "Forbid Duplicates"
+msgstr "Prohibir duplicados"
diff --git a/event_registration_partner_unique/i18n/event_registration_partner_unique.pot b/event_registration_partner_unique/i18n/event_registration_partner_unique.pot
new file mode 100644
index 000000000..72d78d239
--- /dev/null
+++ b/event_registration_partner_unique/i18n/event_registration_partner_unique.pot
@@ -0,0 +1,42 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# * event_registration_partner_unique
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 17.0\n"
+"Report-Msgid-Bugs-To: \n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,help:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid ""
+"Check this to disallow duplicate attendees in this event's registrations"
+msgstr ""
+
+#. module: event_registration_partner_unique
+#. odoo-python
+#: code:addons/event_registration_partner_unique/models/event.py:0
+#, python-format
+msgid "Duplicated partners found in event {0}: {1}."
+msgstr ""
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_event
+msgid "Event"
+msgstr ""
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_registration
+msgid "Event Registration"
+msgstr ""
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,field_description:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid "Forbid Duplicates"
+msgstr ""
diff --git a/event_registration_partner_unique/i18n/fr.po b/event_registration_partner_unique/i18n/fr.po
new file mode 100644
index 000000000..89d92f4b3
--- /dev/null
+++ b/event_registration_partner_unique/i18n/fr.po
@@ -0,0 +1,45 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# * event_registration_partner_unique
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"PO-Revision-Date: 2024-07-03 16:47+0000\n"
+"Last-Translator: Rémi <remi@le-filament.com>\n"
+"Language-Team: none\n"
+"Language: fr\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: nplurals=2; plural=n > 1;\n"
+"X-Generator: Weblate 4.17\n"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,help:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid ""
+"Check this to disallow duplicate attendees in this event's registrations"
+msgstr "Cocher cette case pour interdire les doublons dans les participants"
+
+#. module: event_registration_partner_unique
+#. odoo-python
+#: code:addons/event_registration_partner_unique/models/event.py:0
+#, python-format
+msgid "Duplicated partners found in event {0}: {1}."
+msgstr "Contact en doublon sur l'évènement {0} : {1}."
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_event
+msgid "Event"
+msgstr "Évènement"
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_registration
+msgid "Event Registration"
+msgstr "Inscription à l'évènement"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,field_description:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid "Forbid Duplicates"
+msgstr "Interdire les Doublons"
diff --git a/event_registration_partner_unique/i18n/it.po b/event_registration_partner_unique/i18n/it.po
new file mode 100644
index 000000000..a32d77e79
--- /dev/null
+++ b/event_registration_partner_unique/i18n/it.po
@@ -0,0 +1,56 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# * event_registration_partner_unique
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 14.0\n"
+"Report-Msgid-Bugs-To: \n"
+"PO-Revision-Date: 2023-07-18 14:11+0000\n"
+"Last-Translator: mymage <stefano.consolaro@mymage.it>\n"
+"Language-Team: none\n"
+"Language: it\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: nplurals=2; plural=n != 1;\n"
+"X-Generator: Weblate 4.17\n"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,help:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid ""
+"Check this to disallow duplicate attendees in this event's registrations"
+msgstr ""
+"Selezionare per impedire la duplicazione dei partecipanti nella "
+"registrazioni di questo evento"
+
+#. module: event_registration_partner_unique
+#. odoo-python
+#: code:addons/event_registration_partner_unique/models/event.py:0
+#, python-format
+msgid "Duplicated partners found in event {0}: {1}."
+msgstr "Trovati partner duplicati nell'evento {0}: {1}."
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_event
+msgid "Event"
+msgstr "Evento"
+
+#. module: event_registration_partner_unique
+#: model:ir.model,name:event_registration_partner_unique.model_event_registration
+msgid "Event Registration"
+msgstr "Registrazione evento"
+
+#. module: event_registration_partner_unique
+#: model:ir.model.fields,field_description:event_registration_partner_unique.field_event_event__forbid_duplicates
+msgid "Forbid Duplicates"
+msgstr "Impedisci duplicati"
+
+#~ msgid "Display Name"
+#~ msgstr "Nome visualizzato"
+
+#~ msgid "ID"
+#~ msgstr "ID"
+
+#~ msgid "Last Modified on"
+#~ msgstr "Ultima modifica il"
diff --git a/event_registration_partner_unique/models/__init__.py b/event_registration_partner_unique/models/__init__.py
new file mode 100644
index 000000000..22dee4152
--- /dev/null
+++ b/event_registration_partner_unique/models/__init__.py
@@ -0,0 +1,3 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import event
diff --git a/event_registration_partner_unique/models/event.py b/event_registration_partner_unique/models/event.py
new file mode 100644
index 000000000..ca19d9a03
--- /dev/null
+++ b/event_registration_partner_unique/models/event.py
@@ -0,0 +1,53 @@
+# Copyright 2016 Antiun Ingeniería S.L. - Jairo Llopis
+# Copyright 2020 Tecnativa - Víctor Martínez
+# Copyright 2022 Tecnativa - Luis D. Lafaurie
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class EventEvent(models.Model):
+ _inherit = "event.event"
+
+ forbid_duplicates = fields.Boolean(
+ help="Check this to disallow duplicate attendees in this event's "
+ "registrations",
+ )
+
+ @api.constrains("forbid_duplicates", "registration_ids")
+ def _check_forbid_duplicates(self):
+ """Ensure no duplicated attendee are found in the event."""
+ return self.filtered(
+ "forbid_duplicates"
+ ).registration_ids._check_forbid_duplicates()
+
+
+class EventRegistration(models.Model):
+ _inherit = "event.registration"
+
+ @api.constrains("event_id", "attendee_partner_id")
+ def _check_forbid_duplicates(self):
+ """Ensure no duplicated attendees are found in the event."""
+ for event_reg in self.filtered("event_id.forbid_duplicates"):
+ dupes = self.search(event_reg._duplicate_search_domain())
+ if dupes:
+ # pylint: disable=W8120
+ raise ValidationError(
+ self.env._("Duplicated partners found in event {0}: {1}.").format(
+ event_reg.event_id.display_name,
+ ", ".join(
+ partner_id.display_name
+ for partner_id in dupes.mapped("attendee_partner_id")
+ ),
+ )
+ )
+
+ def _duplicate_search_domain(self):
+ """What to look for when searching duplicates."""
+ return [
+ ("id", "!=", self.id),
+ ("event_id", "=", self.event_id.id),
+ ("attendee_partner_id", "=", self.attendee_partner_id.id),
+ ("attendee_partner_id", "!=", False),
+ ]
diff --git a/event_registration_partner_unique/pyproject.toml b/event_registration_partner_unique/pyproject.toml
new file mode 100644
index 000000000..4231d0ccc
--- /dev/null
+++ b/event_registration_partner_unique/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"
diff --git a/event_registration_partner_unique/readme/CONTRIBUTORS.md b/event_registration_partner_unique/readme/CONTRIBUTORS.md
new file mode 100644
index 000000000..7fb07363c
--- /dev/null
+++ b/event_registration_partner_unique/readme/CONTRIBUTORS.md
@@ -0,0 +1,12 @@
+- [Tecnativa](https://www.tecnativa.com)
+
+ > - Rafael Blasco
+ > - Jairo Llopis
+ > - Vicent Cubells
+ > - Cristina Martin R.
+ > - Victor M.M. Torres
+ > - Víctor Martínez
+ > - Carolina Fernandez
+ > - Juan José Seguí
+- [Heliconia Solutions Pvt. Ltd.](https://www.heliconia.io)
+ - Bhavesh Heliconia
diff --git a/event_registration_partner_unique/readme/DESCRIPTION.md b/event_registration_partner_unique/readme/DESCRIPTION.md
new file mode 100644
index 000000000..4085e6828
--- /dev/null
+++ b/event_registration_partner_unique/readme/DESCRIPTION.md
@@ -0,0 +1,8 @@
+This module is intended for backend use only, and extends the
+functionality of events to avoid duplicating attendees.
+
+It is designed to work alongside *partner_event* (which is a
+dependency), and it is advisable to enable it by clicking on **Create
+Partners in registration**; this way it will create new partners or will
+match existing ones, but at the same time will avoid creating duplicates
+from partners already existing.
diff --git a/event_registration_partner_unique/readme/ROADMAP.md b/event_registration_partner_unique/readme/ROADMAP.md
new file mode 100644
index 000000000..88a3273fa
--- /dev/null
+++ b/event_registration_partner_unique/readme/ROADMAP.md
@@ -0,0 +1,12 @@
+- This module is intended for backend use, so the validation error is
+ enough to show the user what is wrong,
+- When *website_event* is installed, and public users try to register
+ more than one attendee, this will trigger a validation error as the
+ attendee partner is duplicated. The error shown is 500 internal server
+ error.
+- It would be necessary to have a new module which depends on
+ *website_event* plus this one to prevent said issue.
+- Another problem would arise when used with *event_sale* module,
+ because it would try to use "Sale Order" contact as attendee and that
+ will lead to the issue of duplicated attendees if trying to buy access
+ to the same event more than once.
diff --git a/event_registration_partner_unique/readme/USAGE.md b/event_registration_partner_unique/readme/USAGE.md
new file mode 100644
index 000000000..5e5faeb6f
--- /dev/null
+++ b/event_registration_partner_unique/readme/USAGE.md
@@ -0,0 +1,7 @@
+1. Go to **Events** and choose an event or create a new one.
+2. Enable **Forbid Duplicates**.
+3. Go to **Attendees**.
+4. Create a new attendee.
+5. If you try to fill successive attendees with the same contact filled
+ out in the "Attendee Partner" field, the system won't allow it. That
+ can happen for example if the same email is used several times.
diff --git a/event_registration_partner_unique/static/description/icon.png b/event_registration_partner_unique/static/description/icon.png
new file mode 100644
index 000000000..3a0328b51
Binary files /dev/null and b/event_registration_partner_unique/static/description/icon.png differ
diff --git a/event_registration_partner_unique/static/description/index.html b/event_registration_partner_unique/static/description/index.html
new file mode 100644
index 000000000..4a7cac445
--- /dev/null
+++ b/event_registration_partner_unique/static/description/index.html
@@ -0,0 +1,478 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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+<body>
+<div class="document" id="unique-partner-per-event">
+<h1 class="title">Unique Partner per Event</h1>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! This file is generated by oca-gen-addon-readme !!
+!! changes will be overwritten. !!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! source digest: sha256:bb5a0d6ae344dc2e6b76d359cc79a72e0c7c0b5e037723344c5d76cc2ffcace7
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<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/event/tree/18.0/event_registration_partner_unique"><img alt="OCA/event" src="https://img.shields.io/badge/github-OCA%2Fevent-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/event-18-0/event-18-0-event_registration_partner_unique"><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/event&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 is intended for backend use only, and extends the
+functionality of events to avoid duplicating attendees.</p>
+<p>It is designed to work alongside <em>partner_event</em> (which is a
+dependency), and it is advisable to enable it by clicking on <strong>Create
+Partners in registration</strong>; this way it will create new partners or will
+match existing ones, but at the same time will avoid creating duplicates
+from partners already existing.</p>
+<p><strong>Table of contents</strong></p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#usage" id="toc-entry-1">Usage</a></li>
+<li><a class="reference internal" href="#known-issues-roadmap" id="toc-entry-2">Known issues / Roadmap</a></li>
+<li><a class="reference internal" href="#bug-tracker" id="toc-entry-3">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="toc-entry-4">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="toc-entry-5">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="toc-entry-6">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="toc-entry-7">Maintainers</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="usage">
+<h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
+<ol class="arabic simple">
+<li>Go to <strong>Events</strong> and choose an event or create a new one.</li>
+<li>Enable <strong>Forbid Duplicates</strong>.</li>
+<li>Go to <strong>Attendees</strong>.</li>
+<li>Create a new attendee.</li>
+<li>If you try to fill successive attendees with the same contact filled
+out in the “Attendee Partner” field, the system won’t allow it. That
+can happen for example if the same email is used several times.</li>
+</ol>
+</div>
+<div class="section" id="known-issues-roadmap">
+<h1><a class="toc-backref" href="#toc-entry-2">Known issues / Roadmap</a></h1>
+<ul class="simple">
+<li>This module is intended for backend use, so the validation error is
+enough to show the user what is wrong,</li>
+<li>When <em>website_event</em> is installed, and public users try to register
+more than one attendee, this will trigger a validation error as the
+attendee partner is duplicated. The error shown is 500 internal server
+error.</li>
+<li>It would be necessary to have a new module which depends on
+<em>website_event</em> plus this one to prevent said issue.</li>
+<li>Another problem would arise when used with <em>event_sale</em> module,
+because it would try to use “Sale Order” contact as attendee and that
+will lead to the issue of duplicated attendees if trying to buy access
+to the same event more than once.</li>
+</ul>
+</div>
+<div class="section" id="bug-tracker">
+<h1><a class="toc-backref" href="#toc-entry-3">Bug Tracker</a></h1>
+<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/event/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/event/issues/new?body=module:%20event_registration_partner_unique%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">
+<h1><a class="toc-backref" href="#toc-entry-4">Credits</a></h1>
+<div class="section" id="authors">
+<h2><a class="toc-backref" href="#toc-entry-5">Authors</a></h2>
+<ul class="simple">
+<li>Tecnativa</li>
+</ul>
+</div>
+<div class="section" id="contributors">
+<h2><a class="toc-backref" href="#toc-entry-6">Contributors</a></h2>
+<ul>
+<li><p class="first"><a class="reference external" href="https://www.tecnativa.com">Tecnativa</a></p>
+<blockquote>
+<ul class="simple">
+<li>Rafael Blasco</li>
+<li>Jairo Llopis</li>
+<li>Vicent Cubells</li>
+<li>Cristina Martin R.</li>
+<li>Victor M.M. Torres</li>
+<li>Víctor Martínez</li>
+<li>Carolina Fernandez</li>
+<li>Juan José Seguí</li>
+</ul>
+</blockquote>
+</li>
+<li><p class="first"><a class="reference external" href="https://www.heliconia.io">Heliconia Solutions Pvt. Ltd.</a></p>
+<ul class="simple">
+<li>Bhavesh Heliconia</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="maintainers">
+<h2><a class="toc-backref" href="#toc-entry-7">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" />
+</a>
+<p>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.</p>
+<p>This module is part of the <a class="reference external" href="https://github.com/OCA/event/tree/18.0/event_registration_partner_unique">OCA/event</a> project on GitHub.</p>
+<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
+</div>
+</div>
+</div>
+</body>
+</html>
diff --git a/event_registration_partner_unique/tests/__init__.py b/event_registration_partner_unique/tests/__init__.py
new file mode 100644
index 000000000..3c5e143c6
--- /dev/null
+++ b/event_registration_partner_unique/tests/__init__.py
@@ -0,0 +1,3 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import test_event
diff --git a/event_registration_partner_unique/tests/test_event.py b/event_registration_partner_unique/tests/test_event.py
new file mode 100644
index 000000000..95a14228f
--- /dev/null
+++ b/event_registration_partner_unique/tests/test_event.py
@@ -0,0 +1,53 @@
+# Copyright 2016 Antiun Ingeniería S.L. - Jairo Llopis
+# Copyright 2020 Tecnativa - Víctor Martínez
+# Copyright 2023 Tecnativa - Carolina Fernandez
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo.exceptions import ValidationError
+from odoo.tests.common import TransactionCase
+
+
+class DuplicatedPartnerCase(TransactionCase):
+ @classmethod
+ def setUpClass(cls):
+ super().setUpClass()
+ cls.event = cls.env.ref("event.event_0")
+ cls.event.forbid_duplicates = False
+ cls.partner = cls.env.ref("base.res_partner_1")
+ cls.registration = cls.env["event.registration"].create(
+ {
+ "event_id": cls.event.id,
+ "partner_id": cls.partner.id,
+ "attendee_partner_id": cls.partner.id,
+ }
+ )
+
+ def test_allowed(self):
+ """No problem when it is not forbidden."""
+ self.registration.copy()
+
+ def test_forbidden(self):
+ """Cannot when it is forbidden."""
+ self.event.forbid_duplicates = True
+ with self.assertRaises(ValidationError):
+ self.registration.copy(
+ {"attendee_partner_id": self.registration.attendee_partner_id.id}
+ )
+
+ def test_saved_in_exception(self):
+ """The failing partners are saved in the exception."""
+ self.event.forbid_duplicates = True
+ with self.assertRaisesRegex(
+ ValidationError, "Duplicated partners found in event"
+ ):
+ self.registration.copy(
+ {"attendee_partner_id": self.registration.attendee_partner_id.id}
+ )
+
+ def test_duplicates_already_exist(self):
+ """Cannot forbid what already happened."""
+ self.registration.copy(
+ {"attendee_partner_id": self.registration.attendee_partner_id.id}
+ )
+ with self.assertRaises(ValidationError):
+ self.event.forbid_duplicates = True
diff --git a/event_registration_partner_unique/views/event_event_view.xml b/event_registration_partner_unique/views/event_event_view.xml
new file mode 100644
index 000000000..477558f2a
--- /dev/null
+++ b/event_registration_partner_unique/views/event_event_view.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2016 Tecnativa - Jairo Llopis
+ Copyright 2017 Tecnativa - Vicent Cubells
+ License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
+<odoo>
+ <record id="view_event_form" model="ir.ui.view">
+ <field name="name">Add option to avoid duplicates</field>
+ <field name="model">event.event</field>
+ <!-- Make sure this view is loaded after event_sale's one, as it replaces full page -->
+ <field name="priority" eval="99" />
+ <field name="inherit_id" ref="event.view_event_form" />
+ <field name="arch" type="xml">
+ <xpath expr="//field[@name='create_partner']" position="after">
+ <field name="forbid_duplicates" />
+ </xpath>
+ </field>
+ </record>
+</odoo>
diff --git a/test-requirements.txt b/test-requirements.txt
new file mode 100644
index 000000000..a17f0b2a6
--- /dev/null
+++ b/test-requirements.txt
@@ -0,0 +1 @@
+odoo-addon-partner_event @ git+https://github.com/OCA/event.git@refs/pull/435/head#subdirectory=partner_event