diff --git a/mrp_multi_level/models/product_mrp_area.py b/mrp_multi_level/models/product_mrp_area.py
index ce8a2c9097..e6153a005d 100644
--- a/mrp_multi_level/models/product_mrp_area.py
+++ b/mrp_multi_level/models/product_mrp_area.py
@@ -206,18 +206,19 @@ def _compute_supply_method(self):
         boms_by_product = self.env["mrp.bom"]._bom_find(self.mapped("product_id"))
         for rec in self:
             rule = rec._get_rule()
-            if not rule:
+            bom = boms_by_product.get(rec.product_id, self.env["mrp.bom"])
+            if bom.type == "phantom":
+                rec.supply_method = "phantom"
+                rec.supply_bom_id = bom
+            elif not rule:
                 rec.supply_method = "none"
                 rec.supply_bom_id = False
-                continue
-            # Determine the supply method based on the final rule.
-            bom = boms_by_product.get(rec.product_id, self.env["mrp.bom"])
-            rec.supply_method = (
-                "phantom"
-                if rule.action == "manufacture" and bom.type == "phantom"
-                else rule.action
-            )
-            rec.supply_bom_id = bom
+            elif rule.action == "manufacture":
+                rec.supply_method = rule.action
+                rec.supply_bom_id = bom
+            else:
+                rec.supply_method = rule.action
+                rec.supply_bom_id = False
 
     @api.depends(
         "mrp_area_id", "supply_method", "product_id.route_ids", "product_id.seller_ids"
diff --git a/mrp_multi_level/tests/test_mrp_multi_level.py b/mrp_multi_level/tests/test_mrp_multi_level.py
index 8db2b70466..dcff742300 100644
--- a/mrp_multi_level/tests/test_mrp_multi_level.py
+++ b/mrp_multi_level/tests/test_mrp_multi_level.py
@@ -444,11 +444,31 @@ def test_17_supply_method(self):
         self.fp_4.route_ids = [(4, self.env.ref("mrp.route_warehouse0_manufacture").id)]
         product_mrp_area._compute_supply_method()
         self.assertEqual(product_mrp_area.supply_method, "manufacture")
+        # because of the issue discussed here https://github.com/odoo/odoo/pull/188846
+        # we need to apply routes explicitly in the proper order (by sequence)
         self.fp_4.route_ids = [
-            (4, self.env.ref("purchase_stock.route_warehouse0_buy").id)
+            (
+                6,
+                0,
+                (
+                    self.env.ref("stock.route_warehouse0_mto")
+                    + self.env.ref("purchase_stock.route_warehouse0_buy")
+                    + self.env.ref("mrp.route_warehouse0_manufacture")
+                ).ids,
+            )
         ]
         product_mrp_area._compute_supply_method()
         self.assertEqual(product_mrp_area.supply_method, "buy")
+        kit_bom = self.mrp_bom_obj.create(
+            {
+                "product_tmpl_id": self.fp_4.product_tmpl_id.id,
+                "product_id": self.fp_4.id,
+                "type": "phantom",
+            }
+        )
+        product_mrp_area._compute_supply_method()
+        self.assertEqual(product_mrp_area.supply_method, "phantom")
+        self.assertEqual(product_mrp_area.supply_bom_id, kit_bom)
 
     def test_18_priorize_safety_stock(self):
         now = datetime.now()