diff --git a/res_partner_required_fields/README.rst b/res_partner_required_fields/README.rst
new file mode 100644
index 0000000000..080300230e
--- /dev/null
+++ b/res_partner_required_fields/README.rst
@@ -0,0 +1,29 @@
+.. 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
+
+===========================
+Res partner required fields
+===========================
+
+* Required fields in "res.partner" when the potential client becomes an active
+  client.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/avanzosc/odoo-addons/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.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Ana Juaristi <anajuaristi@avanzosc.es>
+* Alfredo de la Fuente <alfredodelafuente@avanzosc.es>
diff --git a/res_partner_required_fields/__init__.py b/res_partner_required_fields/__init__.py
new file mode 100644
index 0000000000..0650744f6b
--- /dev/null
+++ b/res_partner_required_fields/__init__.py
@@ -0,0 +1 @@
+from . import models
diff --git a/res_partner_required_fields/__manifest__.py b/res_partner_required_fields/__manifest__.py
new file mode 100644
index 0000000000..eb15857509
--- /dev/null
+++ b/res_partner_required_fields/__manifest__.py
@@ -0,0 +1,22 @@
+# Copyright 2020 Alfredo de la fuente - AvanzOSC
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Res Partner Required Fields",
+    "version": "18.0.1.0.0",
+    "category": "Sales/CRM",
+    "license": "AGPL-3",
+    "author": "AvanzOSC",
+    "website": "https://github.com/avanzosc/odoo-addons",
+    "depends": [
+        "account",
+        "product",
+        "partner_group_purchase",
+        "commission_oca",
+        "delivery",
+        "account_payment_partner",
+    ],
+    "data": [
+        "views/res_partner_views.xml",
+    ],
+    "installable": True,
+}
diff --git a/res_partner_required_fields/i18n/de.po b/res_partner_required_fields/i18n/de.po
new file mode 100644
index 0000000000..2985e0444f
--- /dev/null
+++ b/res_partner_required_fields/i18n/de.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:23+0000\n"
+"PO-Revision-Date: 2025-08-12 12:23+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr "Kontakt"
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/en_GB.po b/res_partner_required_fields/i18n/en_GB.po
new file mode 100644
index 0000000000..fa3fb9f4aa
--- /dev/null
+++ b/res_partner_required_fields/i18n/en_GB.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:22+0000\n"
+"PO-Revision-Date: 2025-08-12 12:22+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr ""
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/en_US.po b/res_partner_required_fields/i18n/en_US.po
new file mode 100644
index 0000000000..2caa35d3e7
--- /dev/null
+++ b/res_partner_required_fields/i18n/en_US.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:23+0000\n"
+"PO-Revision-Date: 2025-08-12 12:23+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr ""
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/es.po b/res_partner_required_fields/i18n/es.po
new file mode 100644
index 0000000000..bbbd04e80e
--- /dev/null
+++ b/res_partner_required_fields/i18n/es.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:24+0000\n"
+"PO-Revision-Date: 2025-08-12 12:24+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr "Contacto"
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr "Rango del cliente"
diff --git a/res_partner_required_fields/i18n/fr.po b/res_partner_required_fields/i18n/fr.po
new file mode 100644
index 0000000000..2caa35d3e7
--- /dev/null
+++ b/res_partner_required_fields/i18n/fr.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:23+0000\n"
+"PO-Revision-Date: 2025-08-12 12:23+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr ""
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/it.po b/res_partner_required_fields/i18n/it.po
new file mode 100644
index 0000000000..3f362a25d4
--- /dev/null
+++ b/res_partner_required_fields/i18n/it.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:24+0000\n"
+"PO-Revision-Date: 2025-08-12 12:24+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr "Contatto"
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/pt.po b/res_partner_required_fields/i18n/pt.po
new file mode 100644
index 0000000000..3db8f9fdff
--- /dev/null
+++ b/res_partner_required_fields/i18n/pt.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:24+0000\n"
+"PO-Revision-Date: 2025-08-12 12:24+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr "Contacto"
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/res_partner_required_fields.pot b/res_partner_required_fields/i18n/res_partner_required_fields.pot
new file mode 100644
index 0000000000..fa3fb9f4aa
--- /dev/null
+++ b/res_partner_required_fields/i18n/res_partner_required_fields.pot
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:22+0000\n"
+"PO-Revision-Date: 2025-08-12 12:22+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr ""
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/i18n/tr.po b/res_partner_required_fields/i18n/tr.po
new file mode 100644
index 0000000000..285d61ebbc
--- /dev/null
+++ b/res_partner_required_fields/i18n/tr.po
@@ -0,0 +1,27 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* res_partner_required_fields
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 16.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-08-12 12:25+0000\n"
+"PO-Revision-Date: 2025-08-12 12:25+0000\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: res_partner_required_fields
+#: model:ir.model,name:res_partner_required_fields.model_res_partner
+msgid "Contact"
+msgstr "Kontak"
+
+#. module: res_partner_required_fields
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_partner__parent_customer_rank
+#: model:ir.model.fields,field_description:res_partner_required_fields.field_res_users__parent_customer_rank
+msgid "Customer Rank"
+msgstr ""
diff --git a/res_partner_required_fields/models/__init__.py b/res_partner_required_fields/models/__init__.py
new file mode 100644
index 0000000000..91fed54d40
--- /dev/null
+++ b/res_partner_required_fields/models/__init__.py
@@ -0,0 +1 @@
+from . import res_partner
diff --git a/res_partner_required_fields/models/res_partner.py b/res_partner_required_fields/models/res_partner.py
new file mode 100644
index 0000000000..17c75f6e73
--- /dev/null
+++ b/res_partner_required_fields/models/res_partner.py
@@ -0,0 +1,9 @@
+# Copyright 2020 Alfredo de la fuente - AvanzOSC
+# License AGPL-3 - See http://www.gnu.org/licenses/agpl-3.0.html
+from odoo import fields, models
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    parent_customer_rank = fields.Integer(related="parent_id.customer_rank")
diff --git a/res_partner_required_fields/pyproject.toml b/res_partner_required_fields/pyproject.toml
new file mode 100644
index 0000000000..4231d0cccb
--- /dev/null
+++ b/res_partner_required_fields/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"
diff --git a/res_partner_required_fields/views/res_partner_views.xml b/res_partner_required_fields/views/res_partner_views.xml
new file mode 100644
index 0000000000..bb9100198c
--- /dev/null
+++ b/res_partner_required_fields/views/res_partner_views.xml
@@ -0,0 +1,140 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<odoo>
+  <record id="view_partner_form" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="base.view_partner_form" />
+    <field name="priority">100</field>
+    <field name="arch" type="xml">
+      <field name="street" position="before">
+        <field name="customer_rank" invisible="1" />
+        <field name="parent_customer_rank" invisible="1" />
+      </field>
+      <field name="street" position="attributes">
+        <attribute name="required">customer_rank > 0</attribute>
+      </field>
+      <field name="city" position="attributes">
+        <attribute
+          name="required"
+        >customer_rank > 0 and type != 'contact' and parent_id == False</attribute>
+        <attribute name="readonly">type == 'contact' and parent_id != False</attribute>
+      </field>
+      <field name="state_id" position="attributes">
+        <attribute name="required">customer_rank > 0</attribute>
+      </field>
+      <field name="zip" position="attributes">
+        <attribute name="required">customer_rank > 0</attribute>
+      </field>
+      <field name="country_id" position="attributes">
+        <attribute name="required">customer_rank > 0</attribute>
+      </field>
+      <field name="phone" position="attributes">
+        <attribute name="required">customer_rank > 0</attribute>
+      </field>
+      <xpath expr="//group[@name='sale']/field[@name='user_id']" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </xpath>
+      <field name="mobile" position="attributes">
+        <attribute
+          name="required"
+        >parent_customer_rank > 0 and type == 'contact'</attribute>
+      </field>
+      <xpath
+        expr="//field[@name='child_ids']/form//field[@name='function']"
+        position="before"
+      >
+        <field name="customer_rank" invisible="1" />
+      </xpath>
+      <xpath
+        expr="//field[@name='child_ids']/form//field[@name='email']"
+        position="attributes"
+      >
+        <attribute name="required">customer_rank > 0 and type == 'contact'</attribute>
+      </xpath>
+      <page name="sales_purchases" position="attributes">
+        <attribute
+          name="invisible"
+        >parent_id !=  False or (parent_id !=  False and type != 'delivery')</attribute>
+      </page>
+      <field name="vat" position="attributes">
+        <attribute name="required">customer_rank == 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_form_purchase_group" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field
+      name="inherit_id"
+      ref="partner_group_purchase.view_partner_form_purchase_group"
+    />
+    <field name="priority">101</field>
+    <field name="arch" type="xml">
+      <field name="purchase_group_id" position="attributes">
+        <attribute name="invisible">is_company ==  False</attribute>
+        <attribute name="required">customer_rank > 0 and is_company != False</attribute>
+      </field>
+      <field name="purchase_group2_id" position="attributes">
+        <attribute name="invisible">is_company == False</attribute>
+        <attribute name="required">customer_rank > 0 and is_company != False</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_property_form" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="account.view_partner_property_form" />
+    <field name="priority">102</field>
+    <field name="arch" type="xml">
+      <field name="property_account_position_id" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+      <field name="property_payment_term_id" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_form_agent" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="commission_oca.view_partner_form_agent" />
+    <field name="priority">103</field>
+    <field name="arch" type="xml">
+      <field name="agent_ids" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_property_form2" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="delivery.view_partner_property_form" />
+    <field name="priority">104</field>
+    <field name="arch" type="xml">
+      <field name="property_delivery_carrier_id" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_property_form3" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="account_payment_partner.view_partner_property_form" />
+    <field name="priority">105</field>
+    <field name="arch" type="xml">
+      <field name="customer_payment_mode_id" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+
+  <record id="view_partner_property_form4" model="ir.ui.view">
+    <field name="model">res.partner</field>
+    <field name="inherit_id" ref="product.view_partner_property_form" />
+    <field name="priority">106</field>
+    <field name="arch" type="xml">
+      <field name="property_product_pricelist" position="attributes">
+        <attribute name="required">customer_rank > 0 and is_company == True</attribute>
+      </field>
+    </field>
+  </record>
+</odoo>