diff --git a/request_document_tier_validation/README.rst b/request_document_tier_validation/README.rst
new file mode 100644
index 0000000..2fcd91a
--- /dev/null
+++ b/request_document_tier_validation/README.rst
@@ -0,0 +1,60 @@
+==================================
+Request Document - Tier Validation
+==================================
+
+..
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ !! This file is generated by oca-gen-addon-readme !!
+ !! changes will be overwritten. !!
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ !! source digest: sha256:3082a1f1cd93090d7c3c87a105c69b338819e05aa0fa5189084015396b5fb22b
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |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-ecosoft--odoo%2Fecosoft--addons-lightgray.png?logo=github
+ :target: https://github.com/ecosoft-odoo/ecosoft-addons/tree/15.0/request_document_tier_validation
+ :alt: ecosoft-odoo/ecosoft-addons
+
+|badge1| |badge2| |badge3|
+
+# TODO
+
+**Table of contents**
+
+.. contents::
+ :local:
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/ecosoft-odoo/ecosoft-addons/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/ecosoft-odoo/ecosoft-addons/issues/new?body=module:%20request_document_tier_validation%0Aversion:%2015.0%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
+~~~~~~~
+
+* Ecosoft
+
+Contributors
+~~~~~~~~~~~~
+
+* Saran Lim. <saranl@ecosoft.co.th>
+
+Maintainers
+~~~~~~~~~~~
+
+This module is part of the `ecosoft-odoo/ecosoft-addons <https://github.com/ecosoft-odoo/ecosoft-addons/tree/15.0/request_document_tier_validation>`_ project on GitHub.
+
+You are welcome to contribute.
diff --git a/request_document_tier_validation/__init__.py b/request_document_tier_validation/__init__.py
new file mode 100644
index 0000000..4b76c7b
--- /dev/null
+++ b/request_document_tier_validation/__init__.py
@@ -0,0 +1,3 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from . import models
diff --git a/request_document_tier_validation/__manifest__.py b/request_document_tier_validation/__manifest__.py
new file mode 100644
index 0000000..f8bb71b
--- /dev/null
+++ b/request_document_tier_validation/__manifest__.py
@@ -0,0 +1,14 @@
+# Copyright 2024 Ecosoft Co., Ltd (https://ecosoft.co.th)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+ "name": "Request Document - Tier Validation",
+ "version": "15.0.1.0.0",
+ "license": "AGPL-3",
+ "category": "Accounting & Finance",
+ "author": "Ecosoft, Odoo Community Association (OCA)",
+ "website": "https://github.com/ecosoft-odoo/ecosoft-addons",
+ "depends": ["request_document", "base_tier_validation"],
+ "data": [],
+ "installable": True,
+}
diff --git a/request_document_tier_validation/models/__init__.py b/request_document_tier_validation/models/__init__.py
new file mode 100644
index 0000000..d7ec1cf
--- /dev/null
+++ b/request_document_tier_validation/models/__init__.py
@@ -0,0 +1,4 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import request_request
+from . import tier_definition
diff --git a/request_document_tier_validation/models/request_request.py b/request_document_tier_validation/models/request_request.py
new file mode 100644
index 0000000..fb72591
--- /dev/null
+++ b/request_document_tier_validation/models/request_request.py
@@ -0,0 +1,13 @@
+# Copyright 2024 Ecosoft Co., Ltd. (http://ecosoft.co.th)
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from odoo import models
+
+
+class RequestRequest(models.Model):
+ _name = "request.request"
+ _inherit = ["request.request", "tier.validation"]
+ _state_from = ["submit"]
+ _state_to = ["approve", "done"]
+
+ _tier_validation_manual_config = False
diff --git a/request_document_tier_validation/models/tier_definition.py b/request_document_tier_validation/models/tier_definition.py
new file mode 100644
index 0000000..8ff054a
--- /dev/null
+++ b/request_document_tier_validation/models/tier_definition.py
@@ -0,0 +1,14 @@
+# Copyright 2019 Ecosoft Co., Ltd. (http://ecosoft.co.th)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, models
+
+
+class TierDefinition(models.Model):
+ _inherit = "tier.definition"
+
+ @api.model
+ def _get_tier_validation_model_names(self):
+ res = super()._get_tier_validation_model_names()
+ res.append("request.request")
+ return res
diff --git a/request_document_tier_validation/pyproject.toml b/request_document_tier_validation/pyproject.toml
new file mode 100644
index 0000000..4231d0c
--- /dev/null
+++ b/request_document_tier_validation/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"
diff --git a/request_document_tier_validation/readme/CONTRIBUTORS.rst b/request_document_tier_validation/readme/CONTRIBUTORS.rst
new file mode 100644
index 0000000..cc6b231
--- /dev/null
+++ b/request_document_tier_validation/readme/CONTRIBUTORS.rst
@@ -0,0 +1 @@
+* Saran Lim. <saranl@ecosoft.co.th>
diff --git a/request_document_tier_validation/readme/DESCRIPTION.rst b/request_document_tier_validation/readme/DESCRIPTION.rst
new file mode 100644
index 0000000..4640904
--- /dev/null
+++ b/request_document_tier_validation/readme/DESCRIPTION.rst
@@ -0,0 +1 @@
+# TODO
diff --git a/request_document_tier_validation/static/description/index.html b/request_document_tier_validation/static/description/index.html
new file mode 100644
index 0000000..ea73f63
--- /dev/null
+++ b/request_document_tier_validation/static/description/index.html
@@ -0,0 +1,416 @@
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+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="generator" content="Docutils: https://docutils.sourceforge.io/" />
+<title>Request Document - Tier Validation</title>
+<style type="text/css">
+
+/*
+:Author: David Goodger (goodger@python.org)
+:Id: $Id: html4css1.css 9511 2024-01-13 09:50:07Z milde $
+:Copyright: This stylesheet has been placed in the public domain.
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+Default cascading style sheet for the HTML output of Docutils.
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+See https://docutils.sourceforge.io/docs/howto/html-stylesheets.html for how to
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+</style>
+</head>
+<body>
+<div class="document" id="request-document-tier-validation">
+<h1 class="title">Request Document - Tier Validation</h1>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! This file is generated by oca-gen-addon-readme !!
+!! changes will be overwritten. !!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! source digest: sha256:3082a1f1cd93090d7c3c87a105c69b338819e05aa0fa5189084015396b5fb22b
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<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/ecosoft-odoo/ecosoft-addons/tree/15.0/request_document_tier_validation"><img alt="ecosoft-odoo/ecosoft-addons" src="https://img.shields.io/badge/github-ecosoft--odoo%2Fecosoft--addons-lightgray.png?logo=github" /></a></p>
+<p># TODO</p>
+<p><strong>Table of contents</strong></p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#bug-tracker" id="toc-entry-1">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="toc-entry-2">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="toc-entry-3">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="toc-entry-4">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="toc-entry-5">Maintainers</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="bug-tracker">
+<h1><a class="toc-backref" href="#toc-entry-1">Bug Tracker</a></h1>
+<p>Bugs are tracked on <a class="reference external" href="https://github.com/ecosoft-odoo/ecosoft-addons/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/ecosoft-odoo/ecosoft-addons/issues/new?body=module:%20request_document_tier_validation%0Aversion:%2015.0%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-2">Credits</a></h1>
+<div class="section" id="authors">
+<h2><a class="toc-backref" href="#toc-entry-3">Authors</a></h2>
+<ul class="simple">
+<li>Ecosoft</li>
+</ul>
+</div>
+<div class="section" id="contributors">
+<h2><a class="toc-backref" href="#toc-entry-4">Contributors</a></h2>
+<ul class="simple">
+<li>Saran Lim. <<a class="reference external" href="mailto:saranl@ecosoft.co.th">saranl@ecosoft.co.th</a>></li>
+</ul>
+</div>
+<div class="section" id="maintainers">
+<h2><a class="toc-backref" href="#toc-entry-5">Maintainers</a></h2>
+<p>This module is part of the <a class="reference external" href="https://github.com/ecosoft-odoo/ecosoft-addons/tree/15.0/request_document_tier_validation">ecosoft-odoo/ecosoft-addons</a> project on GitHub.</p>
+<p>You are welcome to contribute.</p>
+</div>
+</div>
+</div>
+</body>
+</html>