diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9c283fd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,74 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+/.venv
+/.pytest_cache
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+bin/
+build/
+develop-eggs/
+dist/
+eggs/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+*.eggs
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+
+# Pycharm
+.idea
+
+# Eclipse
+.settings
+
+# Visual Studio cache/options directory
+.vs/
+.vscode
+
+# OSX Files
+.DS_Store
+
+# Django stuff:
+*.log
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Rope
+.ropeproject
+
+# Sphinx documentation
+docs/_build/
+
+# Backup files
+*~
+*.swp
+
+# OCA rules
+!static/lib/
diff --git a/__manifest__.py b/__manifest__.py
index 52d08de..a92819b 100644
--- a/__manifest__.py
+++ b/__manifest__.py
@@ -17,17 +17,14 @@
 #    DEALINGS IN THE SOFTWARE.
 #
 {
-    'name': 'bemade_multiple_billing_contacts',
+    'name': 'Partner Root Ancestor',
     'version': '15.0.1.0.0',
-    'summary': 'Send invoices to multiple contacts by default.',
-    'description': """By default, newly created invoices add all invoice addresses for the given partner as
-                      followers on the invoice. If billing contacts are set manually on the sales order, those billing
-                      contacts are added as followers on the invoice instead.""",
-    'category': 'Invoicing Management',
+    'summary': 'Technical module to add the field root_ancestor to res.partner.',
+    'category': 'Generic Modules/Base',
     'author': 'Bemade Inc.',
     'website': 'https://www.bemade.org',
     'license': 'OPL-1',
-    'depends': ['sale', 'account'],
+    'depends': ['base'],
     'data': [],
     'demo': [],
     'installable': True,
diff --git a/models/__init__.py b/models/__init__.py
index 8b13789..91fed54 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -1 +1 @@
-
+from . import res_partner
diff --git a/models/account_move.py b/models/account_move.py
deleted file mode 100644
index e69de29..0000000
diff --git a/models/res_partner.py b/models/res_partner.py
index fa220a5..9028c93 100644
--- a/models/res_partner.py
+++ b/models/res_partner.py
@@ -4,13 +4,11 @@ from odoo import models, fields, api, _, Command
 class Partner(models.Model):
     _inherit = 'res.partner'
 
-    def _billing_contacts_domain(self):
-        self.ensure_one()
-        return [('is_company', '=', False), ('root_ancestor', '=', self.root_ancestor)]
-    billing_contacts = fields.Many2many(string='Default Billing Contacts',
-                                        comodel_name='res.partner',
-                                        relation='res_partner_billing_contact_rel',
-                                        column1='billing_contact_id',
-                                        column2='billed_partner_id',
-                                        domain=_billing_contacts_domain,
-                                        tracking=True)
\ No newline at end of file
+    root_ancestor = fields.Many2one(comodel_name='res.partner',
+                                    string='Root Ancestor',
+                                    compute='_compute_root_ancestor')
+
+    @api.depends('parent_id')
+    def _compute_root_ancestor(self):
+        for rec in self:
+            rec.root_ancestor = rec.parent_id and rec.parent_id.root_ancestor or rec
diff --git a/models/sale_order.py b/models/sale_order.py
deleted file mode 100644
index ed1dad9..0000000
--- a/models/sale_order.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from odoo import models, fields, api, _, Command
-
-
-class SaleOrder(models.Model):
-    _inherit = 'sale.order'
-
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..77fc5d6
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+from . import test_root_ancestor
diff --git a/tests/test_root_ancestor.py b/tests/test_root_ancestor.py
new file mode 100644
index 0000000..a4e747e
--- /dev/null
+++ b/tests/test_root_ancestor.py
@@ -0,0 +1,55 @@
+from odoo.tests.common import TransactionCase, tagged
+from odoo import Command
+
+
+class TestPartnerRootAncestor(TransactionCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        partner = cls.env['res.partner']
+        cls.common_ancestor = partner.create({
+            'name': 'Parnter name',
+            'company_type': 'company',
+        })
+        cls.first_child = partner.create({
+            'name': 'Child name',
+            'company_type': 'company',
+            'parent_id': cls.common_ancestor.id,
+        })
+        cls.second_child = partner.create({
+            'name': 'Child name',
+            'company_type': 'company',
+            'parent_id': cls.common_ancestor.id,
+        })
+        cls.first_grandchild = partner.create({
+            'name': 'Grandchild name',
+            'company_type': 'person',
+            'parent_id': cls.first_child.id,
+        })
+        cls.second_grandchild = partner.create({
+            'name': 'Grandchild name',
+            'company_type': 'person',
+            'parent_id': cls.second_child.id,
+        })
+        cls.unrelated_partner = partner.create({
+            'name': 'Unrelated partner',
+        })
+        cls.relatives = [cls.common_ancestor, cls.first_child, cls.second_child, cls.first_grandchild,
+                     cls.second_grandchild]
+
+    @tagged('-at_install', 'post_install')
+    def testBaseCase(self):
+        for r1 in self.relatives:
+            self.assertFalse(r1.root_ancestor == self.unrelated_partner)
+            for r2 in self.relatives:
+                self.assertTrue(r1.root_ancestor == r2.root_ancestor)
+
+    @tagged('-at_install', 'post_install')
+    def testNewRelative(self):
+        new_relative = self.env['res.partner'].create({
+            'name': 'Whatever',
+            'company_type': 'person',
+            'parent_id': self.second_grandchild.id,
+        })
+        for r1 in self.relatives:
+            self.assertTrue(r1.root_ancestor == new_relative.root_ancestor)
\ No newline at end of file