[IMP] product, purchase: vendor reference in multi-company

- Create 2 companies A & B
- On a product P, define 2 suppliers (same vendor), one for each
  company, but with a different Vendor Product Code
- Create a PO in A for P

Both supplier codes are proposed in the Many2one widget, while only the
code for A is expected.

Fixes #27857
opw-1894952

closes odoo/odoo#28402

addons/product/models/product.py

@@ -381,6 +381,7 @@ class ProductProduct(models.Model):
             partner_ids = [partner_id, self.env['res.partner'].browse(partner_id).commercial_partner_id.id]
         else:
             partner_ids = []
+        company_id = self.env.context.get('company_id')
 
         # all user don't have access to seller and partner
         # check access and use superuser
@@ -399,6 +400,11 @@ class ProductProduct(models.Model):
                 sellers = [x for x in product.seller_ids if (x.name.id in partner_ids) and (x.product_id == product)]
                 if not sellers:
                     sellers = [x for x in product.seller_ids if (x.name.id in partner_ids) and not x.product_id]
+                # Filter out sellers based on the company. This is done afterwards for a better
+                # code readability. At this point, only a few sellers should remain, so it should
+                # not be a performance issue.
+                if company_id:
+                    sellers = [x for x in sellers if x.company_id.id in [company_id, False]]
             if sellers:
                 for s in sellers:
                     seller_variant = s.product_name and (

addons/product/tests/test_seller.py

@@ -10,6 +10,11 @@ class TestSeller(TransactionCase):
         super(TestSeller, self).setUp()
         self.product_service = self.env.ref('product.product_product_2')
         self.product_service.default_code = 'DEFCODE'
+        self.product_consu = self.env['product.product'].create({
+            'name': 'Boudin',
+            'type': 'consu',
+        })
+        self.product_consu.default_code = 'DEFCODE'
         self.asustec = self.env.ref('base.res_partner_1')
         self.camptocamp = self.env.ref('base.res_partner_12')
 
@@ -26,3 +31,35 @@ class TestSeller(TransactionCase):
                            .with_context(partner_id=self.camptocamp.id)\
                            .code
         self.assertEqual('C2CCODE', context_code, "Partner's code not used in product name with context set")
+
+    def test_20_sellers_company(self):
+        company_a = self.env.user.company_id
+        company_b = self.env['res.company'].create({
+            'name': 'Saucisson Inc.',
+        })
+        self.product_consu.write({'seller_ids': [
+            (0, 0, {'name': self.asustec.id, 'product_code': 'A', 'company_id': company_a.id}),
+            (0, 0, {'name': self.asustec.id, 'product_code': 'B', 'company_id': company_b.id}),
+            (0, 0, {'name': self.asustec.id, 'product_code': 'NO', 'company_id': False}),
+        ]})
+
+        names = self.product_consu.with_context(
+            partner_id=self.asustec.id,
+        ).name_get()
+        ref = set([x[1] for x in names])
+        self.assertEqual(len(names), 3, "3 vendor references should have been found")
+        self.assertEqual(ref, {'[A] Boudin', '[B] Boudin', '[NO] Boudin'}, "Incorrect vendor reference list")
+        names = self.product_consu.with_context(
+            partner_id=self.asustec.id,
+            company_id=company_a.id,
+        ).name_get()
+        ref = set([x[1] for x in names])
+        self.assertEqual(len(names), 2, "2 vendor references should have been found")
+        self.assertEqual(ref, {'[A] Boudin', '[NO] Boudin'}, "Incorrect vendor reference list")
+        names = self.product_consu.with_context(
+            partner_id=self.asustec.id,
+            company_id=company_b.id,
+        ).name_get()
+        ref = set([x[1] for x in names])
+        self.assertEqual(len(names), 2, "2 vendor references should have been found")
+        self.assertEqual(ref, {'[B] Boudin', '[NO] Boudin'}, "Incorrect vendor reference list")

addons/purchase/models/purchase.py

@@ -576,6 +576,7 @@ class PurchaseOrderLine(models.Model):
         product_lang = self.product_id.with_context(
             lang=self.partner_id.lang,
             partner_id=self.partner_id.id,
+            company_id=self.company_id.id,
         )
         self.name = product_lang.display_name
         if product_lang.description_purchase: