[FIX] stock: muliple rules leadtime

Steps to Reproduce on Runbot:
- Install MRP
- Create a second warehouse
- Go to Warehouse -> Routes -> Manufacturing.
- Set the "Supplied Warehouse" to the first warehouse.
- In Inventory > Opertaions > Replenishment
- Create a new Replenishment with Manufacturing route
- click on Replenishment information (small "i" button)
- Expected singelton traceback error.

Fix:
get_lead_time in Manufacturing expects a single rule
using _get_rule to deteermine the correct rule as the
comment sugessted

opw-3838099

closes odoo/odoo#163318

Signed-off-by: William Henrotin (whe) <whe@odoo.com>

addons/mrp/tests/test_replenish.py

@@ -40,6 +40,38 @@ class TestMrpReplenish(TestMrpCommon):
             wizard3 = self._create_wizard(product, wh)
             self.assertEqual(fields.Datetime.from_string('2023-01-06 00:00:00'), wizard3.date_planned)
 
+    def test_mrp_orderpoint_leadtime(self):
+        self.warehouse = self.env.ref('stock.warehouse0')
+        route_manufacture = self.warehouse.manufacture_pull_id.route_id
+        route_manufacture.supplied_wh_id = self.warehouse
+        route_manufacture.supplier_wh_id = self.warehouse
+        route_manufacture.rule_ids.delay = 2
+        product_1 = self.env['product.product'].create({
+            'name': 'Cake',
+            'type': 'product',
+            'route_ids': [(6, 0, [route_manufacture.id])]
+        })
+
+        self.env['mrp.bom'].create({
+            'product_tmpl_id': product_1.product_tmpl_id.id,
+            'produce_delay': 4,
+            'product_qty': 1,
+        })
+
+        # setup orderpoint (reordering rule)
+        rr = self.env['stock.warehouse.orderpoint'].create({
+            'name': 'Cake RR',
+            'location_id': self.warehouse.lot_stock_id.id,
+            'product_id': product_1.id,
+            'product_min_qty': 0,
+            'product_max_qty': 5,
+        })
+
+        info = self.env['stock.replenishment.info'].create({'orderpoint_id': rr.id})
+
+        # for manufacturing delay should be taken from the bom
+        self.assertEqual("4.0 days", info.wh_replenishment_option_ids.lead_time)
+
     def test_mrp_delay_bom(self):
         route = self.env.ref('mrp.route_warehouse0_manufacture')
         product = self.product_4

addons/stock/wizard/stock_replenishment_info.py

@@ -118,8 +118,11 @@ class StockReplenishmentOption(models.TransientModel):
     @api.depends('replenishment_info_id')
     def _compute_lead_time(self):
         for record in self:
-            lead_time = record.route_id.rule_ids._get_lead_days(record.product_id)[0]['total_delay']    #TO FIX: use _get_rule to avoid singleton issue
-            record.lead_time = str(lead_time) + " days"
+            rule = self.env['procurement.group']._get_rule(record.product_id, record.location_id, {
+                'route_ids': record.route_id,
+                'warehouse_id': record.warehouse_id,
+            })
+            record.lead_time = str(rule._get_lead_days(record.product_id)[0]['total_delay'] if rule else 0) + " days"
 
     @api.depends('warehouse_id', 'free_qty', 'uom', 'qty_to_order')
     def _compute_warning_message(self):