diff --git a/purchase_stock_ux/models/stock_rule.py b/purchase_stock_ux/models/stock_rule.py
index d69ab9a1..daf2e487 100644
--- a/purchase_stock_ux/models/stock_rule.py
+++ b/purchase_stock_ux/models/stock_rule.py
@@ -24,7 +24,7 @@ def _prepare_purchase_order_line(self, product_id, product_qty, product_uom, com
         # if price was not computed (not seller or seller price = 0.0), then
         # use standar price
         if not res["price_unit"]:
-            price_unit = product_id.with_context(force_company=company_id.id).standard_price
+            price_unit = product_id.with_company(company_id).standard_price
             company_currency = company_id.currency_id
             if price_unit and po.currency_id != company_currency:
                 price_unit = company_currency._convert(
@@ -42,14 +42,14 @@ def _update_purchase_order_line(self, product_id, product_qty, product_uom, comp
         # if price was not computed (not seller or seller price = 0.0), then
         # use standar price
         if not res["price_unit"]:
-            price_unit = product_id.with_context(force_company=company_id.id).standard_price
+            price_unit = product_id.with_company(company_id).standard_price
             company_currency = company_id.currency_id
             if price_unit and line.order_id.currency_id != company_currency:
                 price_unit = company_currency._convert(
                     price_unit, line.order_id.currency_id, company_id, line.order_id.date_order or fields.Date.today()
                 )
-            if price_unit and line.product_uom and product_id.uom_id != line.product_uom:
-                price_unit = product_id.uom_id._compute_price(price_unit, line.product_uom)
+            if price_unit and line.product_uom_id and product_id.uom_id != line.product_uom_id:
+                price_unit = product_id.uom_id._compute_price(price_unit, line.product_uom_id)
             res["price_unit"] = price_unit
         return res
 
diff --git a/purchase_stock_ux/tests/__init__.py b/purchase_stock_ux/tests/__init__.py
index 76f30cf0..99e464fd 100644
--- a/purchase_stock_ux/tests/__init__.py
+++ b/purchase_stock_ux/tests/__init__.py
@@ -6,3 +6,4 @@
 from . import test_purchase_order
 from . import test_stock_orderpoint
 from . import test_qty_returned
+from . import test_stock_rule
diff --git a/purchase_stock_ux/tests/test_stock_rule.py b/purchase_stock_ux/tests/test_stock_rule.py
new file mode 100644
index 00000000..34dccf38
--- /dev/null
+++ b/purchase_stock_ux/tests/test_stock_rule.py
@@ -0,0 +1,45 @@
+from odoo import Command
+from odoo.tests import TransactionCase, tagged
+
+
+@tagged("post_install", "-at_install")
+class TestStockRule(TransactionCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.partner = cls.env["res.partner"].create({"name": "Vendor"})
+        cls.warehouse = cls.env["stock.warehouse"].search([("company_id", "=", cls.env.company.id)], limit=1)
+        cls.product = cls.env["product.product"].create(
+            {
+                "name": "Product without vendor price",
+                "is_storable": True,
+                "standard_price": 100.0,
+                "route_ids": [Command.link(cls.env.ref("purchase_stock.route_warehouse0_buy").id)],
+                "seller_ids": [Command.create({"partner_id": cls.partner.id, "price": 0.0})],
+            }
+        )
+
+    def _run_buy_procurement(self, qty):
+        self.env["stock.rule"].run(
+            [
+                self.env["stock.rule"].Procurement(
+                    self.product,
+                    qty,
+                    self.product.uom_id,
+                    self.warehouse.lot_stock_id,
+                    "Test",
+                    "Test",
+                    self.env.company,
+                    {"warehouse_id": self.warehouse},
+                )
+            ]
+        )
+
+    def test_merge_po_line_falls_back_to_standard_price(self):
+        """Merging a procurement into an existing PO line uses the product cost when the vendor has no price."""
+        self._run_buy_procurement(1)
+        self._run_buy_procurement(1)
+        line = self.env["purchase.order.line"].search([("product_id", "=", self.product.id)])
+        self.assertEqual(len(line), 1)
+        self.assertEqual(line.product_qty, 2)
+        self.assertEqual(line.price_unit, 100.0)