[FIX] purchase_stock: trigger RR with a defined supplied

In a 2-steps configuration, trigger a reordering rule with the vendor
defined will raise an error

To reproduce the issue:
1. In Settings, enable "Multi-Step Routes"
2. Edit the existing warehouse:
    - Incoming Shipments: 2 steps
3. Create a product P:
    - Type: Storable
    - Add a vendor V
    - Routes: Buy
4. Create a reordering rule R for P:
    - Trigger: Manual
    - Min = Max = 1
5. Open the Replenishment page and edit R:
    - Preferred Route: Buy
    - Vendor: V
6. Trigger the orderpoint

Error: An Odoo Server Error is displayed "AttributeError:
'product.supplierinfo' object has no attribute 'name'"

When triggering the orderpoint, it leads to
https://github.com/odoo/odoo/blob/c75a1a8ac9eef6c7d7c95b7bbbb22d919b952e26/addons/purchase_stock/models/stock_rule.py#L331
However, since [1], the `name` of a `product.supplierinfo` has been
renamed to `partner_id`

[1] f3fe2d50d9

OPW-2780562

closes odoo/odoo#90597

X-original-commit: bda8b0e610f7ec9b0bcb76de3bb52fb6049f62ff
Signed-off-by: Arnold Moyaux <arm@odoo.com>
Signed-off-by: Adrien Widart <awt@odoo.com>

addons/purchase_stock/models/stock_rule.py

@@ -328,6 +328,6 @@ class StockRule(models.Model):
         if values.get('supplierinfo_name'):
             move_values['restrict_partner_id'] = values['supplierinfo_name'].id
         elif values.get('supplierinfo_id'):
-            partner = values['supplierinfo_id'].name
+            partner = values['supplierinfo_id'].partner_id
             move_values['restrict_partner_id'] = partner.id
         return move_values

addons/purchase_stock/tests/test_reordering_rule.py

@@ -656,3 +656,29 @@ class TestReorderingRule(TransactionCase):
             {'product_id': self.product_01.id, 'qty_done': 1.0, 'state': 'done', 'location_dest_id': stock_location.id},
             {'product_id': self.product_01.id, 'qty_done': 2.0, 'state': 'done', 'location_dest_id': sub_location.id},
         ])
+
+    def test_2steps_and_partner_on_orderpoint(self):
+        """
+        Suppose a 2-steps receipt
+        This test ensures that an orderpoint with its route and supplied defined correctly works
+        """
+        warehouse = self.env['stock.warehouse'].search([('company_id', '=', self.env.company.id)])
+        route_buy_id = self.ref('purchase_stock.route_warehouse0_buy')
+
+        warehouse.reception_steps = 'two_steps'
+
+        orderpoint = self.env['stock.warehouse.orderpoint'].create({
+            'name': 'RR for %s' % self.product_01.name,
+            'warehouse_id': warehouse.id,
+            'location_id': warehouse.lot_stock_id.id,
+            'trigger': 'manual',
+            'product_id': self.product_01.id,
+            'product_min_qty': 1,
+            'product_max_qty': 5,
+            'route_id': route_buy_id,
+            'supplier_id': self.product_01.seller_ids.id,
+        })
+        orderpoint.action_replenish()
+
+        po_line = self.env['purchase.order.line'].search([('partner_id', '=', self.partner.id), ('product_id', '=', self.product_01.id)])
+        self.assertEqual(po_line.product_qty, 5)