[FIX] purchase: supplier on parent company

- Create a product and set a contact as the vendor (for instance, Arthur
  Gomez from Asustek in the runbot)
- Set a specific name and code for the supplier
- Create a RFQ for this vendor (Arthur Gomez - the contact person)
- Add the product, confirm the RFQ

On the product, the company (Asustek) is automatically added as vendor,
but there is no vendor name and code.

opw-1929745

closes odoo/odoo#30891

addons/purchase/models/purchase.py

@@ -448,6 +448,16 @@ class PurchaseOrder(models.Model):
                     'currency_id': currency.id,
                     'delay': 0,
                 }
+                # In case the order partner is a contact address, a new supplierinfo is created on
+                # the parent company. In this case, we keep the product name and code.
+                seller = line.product_id._select_seller(
+                    partner_id=line.partner_id,
+                    quantity=line.product_qty,
+                    date=line.order_id.date_order and line.order_id.date_order[:10],
+                    uom_id=line.product_uom)
+                if seller:
+                    supplierinfo['product_name'] = seller.product_name
+                    supplierinfo['product_code'] = seller.product_code
                 vals = {
                     'seller_ids': [(0, 0, supplierinfo)],
                 }