[FIX] product: standard_price depends on company context

Product templates standard_price (cost) is company_dependent,
because the product_product standard_price is company dependent.

closes odoo/odoo#47041

Forward-port-of: odoo/odoo#46841
X-original-commit: 30ee9f1ac411aca9c2bf2158fca9be7db743616d
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/product/models/product_template.py

@@ -217,8 +217,11 @@ class ProductTemplate(models.Model):
         else:
             self.write({'list_price': self.price})
 
+    @api.depends_context('company')
     @api.depends('product_variant_ids', 'product_variant_ids.standard_price')
     def _compute_standard_price(self):
+        # Depends on force_company context because standard_price is company_dependent
+        # on the product_product
         unique_variants = self.filtered(lambda template: len(template.product_variant_ids) == 1)
         for template in unique_variants:
             template.standard_price = template.product_variant_ids.standard_price

addons/product/tests/test_variants.py

@@ -210,6 +210,28 @@ class TestVariants(common.TestProductCommon):
         self.assertEqual(variant_copy.name, 'Test Copy (copy) (copy)')
         self.assertEqual(len(variant_copy.product_variant_ids), 2)
 
+    def test_standard_price(self):
+        """ Ensure template values are correctly (re)computed depending on the context """
+        one_variant_product = self.product_1
+        self.assertEqual(one_variant_product.product_variant_count, 1)
+
+        company_a = self.env.company
+        company_b = self.env['res.company'].create({'name': 'CB', 'currency_id': self.env.ref('base.VEF').id})
+
+        self.assertEqual(one_variant_product.cost_currency_id, company_a.currency_id)
+        self.assertEqual(one_variant_product.with_company(company_b).cost_currency_id, company_b.currency_id)
+
+        one_variant_template = one_variant_product.product_tmpl_id
+        self.assertEqual(one_variant_product.standard_price, one_variant_template.standard_price)
+        one_variant_product.with_company(company_b).standard_price = 500.0
+        self.assertEqual(
+            one_variant_product.with_company(company_b).standard_price,
+            one_variant_template.with_company(company_b).standard_price
+        )
+        self.assertEqual(
+            500.0,
+            one_variant_template.with_company(company_b).standard_price
+        )
 
 class TestVariantsNoCreate(common.TestProductCommon):