diff --git a/addons/stock/i18n/stock.pot b/addons/stock/i18n/stock.pot
index 7c59c42a62e..e837b78a557 100644
--- a/addons/stock/i18n/stock.pot
+++ b/addons/stock/i18n/stock.pot
@@ -7409,6 +7409,14 @@ msgid ""
 " on products and product categories"
 msgstr ""
 
+#. module: stock
+#. odoo-python
+#: code:addons/stock/models/stock_location.py:0
+#: code:addons/stock/models/stock_rule.py:0
+#, python-format
+msgid "Rule %s belongs to %s while the route belongs to %s."
+msgstr ""
+
 #. module: stock
 #: model:ir.model.fields,field_description:stock.field_stock_rule__rule_message
 msgid "Rule Message"
diff --git a/addons/stock/models/stock_location.py b/addons/stock/models/stock_location.py
index 1c9cbb19450..4609ef5090f 100644
--- a/addons/stock/models/stock_location.py
+++ b/addons/stock/models/stock_location.py
@@ -472,3 +472,13 @@ class StockRoute(models.Model):
         for route in self:
             route.with_context(active_test=False).rule_ids.filtered(lambda ru: ru.active == route.active).toggle_active()
         super().toggle_active()
+
+    @api.constrains('company_id')
+    def _check_company_consistency(self):
+        for route in self:
+            if not route.company_id:
+                continue
+
+            for rule in route.rule_ids:
+                if route.company_id.id != rule.company_id.id:
+                    raise ValidationError(_("Rule %s belongs to %s while the route belongs to %s.", rule.display_name, rule.company_id.display_name, route.company_id.display_name))
diff --git a/addons/stock/models/stock_rule.py b/addons/stock/models/stock_rule.py
index 0d5f58c0ad0..b46e15d1f15 100644
--- a/addons/stock/models/stock_rule.py
+++ b/addons/stock/models/stock_rule.py
@@ -7,7 +7,7 @@ from collections import defaultdict, namedtuple
 from dateutil.relativedelta import relativedelta
 
 from odoo import SUPERUSER_ID, _, api, fields, models, registry
-from odoo.exceptions import UserError
+from odoo.exceptions import UserError, ValidationError
 from odoo.osv import expression
 from odoo.tools import float_compare, float_is_zero, html_escape
 from odoo.tools.misc import split_every
@@ -107,6 +107,13 @@ class StockRule(models.Model):
             default['name'] = _("%s (copy)", self.name)
         return super().copy(default=default)
 
+    @api.constrains('company_id')
+    def _check_company_consistency(self):
+        for rule in self:
+            route = rule.route_id
+            if route.company_id and rule.company_id.id != route.company_id.id:
+                raise ValidationError(_("Rule %s belongs to %s while the route belongs to %s.", rule.display_name, rule.company_id.display_name, route.company_id.display_name))
+
     @api.onchange('picking_type_id')
     def _onchange_picking_type(self):
         """ Modify locations to the default picking type's locations source and
diff --git a/addons/stock/models/stock_warehouse.py b/addons/stock/models/stock_warehouse.py
index 9959db6f942..540e6566a9a 100644
--- a/addons/stock/models/stock_warehouse.py
+++ b/addons/stock/models/stock_warehouse.py
@@ -797,7 +797,7 @@ class Warehouse(models.Model):
             'product_categ_selectable': True,
             'supplied_wh_id': self.id,
             'supplier_wh_id': supplier_warehouse.id,
-            'company_id': self.company_id.id,
+            'company_id': (self.company_id & supplier_warehouse.company_id).id,
         }
 
     # Pull / Push tools
diff --git a/addons/stock/tests/test_multicompany.py b/addons/stock/tests/test_multicompany.py
index d7953544423..fb268c43a1a 100644
--- a/addons/stock/tests/test_multicompany.py
+++ b/addons/stock/tests/test_multicompany.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo.exceptions import UserError
+from odoo.exceptions import UserError, ValidationError
 from odoo.tests.common import TransactionCase, Form
 
 
@@ -618,3 +618,32 @@ class TestMultiCompany(TransactionCase):
         self.assertEqual(lot_a.name, 'lot a')
         self.assertEqual(lot_b.company_id, self.company_b)
         self.assertEqual(lot_b.name, 'lot b')
+
+    def test_route_rules_company_consistency(self):
+        route = self.env['stock.route'].create({
+            'name': 'Test Route',
+            'company_id': self.company_a.id,
+            'rule_ids': [
+                (0, 0, {
+                    'name': 'Buy',
+                    'action': 'pull_push',
+                    'company_id': self.company_a.id,
+                    'location_dest_id': self.stock_location_a.id,
+                    'picking_type_id': self.warehouse_a.in_type_id.id,
+                })
+            ]
+        })
+
+        with self.assertRaises(ValidationError):
+            route.write({'company_id': self.company_b.id})
+
+        with self.assertRaises(ValidationError):
+            route.write({'rule_ids': [
+                (0, 0, {
+                    'name': 'Buy',
+                    'action': 'pull_push',
+                    'company_id': self.company_b.id,
+                    'location_dest_id': self.stock_location_b.id,
+                    'picking_type_id': self.warehouse_b.in_type_id.id,
+                })
+            ]})