[FIX]sale_commission_product_criteria_domain: consider multiple agents

sale_commission_product_criteria_domain/tests/test_sale_commission_product_criteria_domain.py

@@ -105,8 +105,14 @@ def test_commission_domain_demo_cases(self):
         invoice.recompute_lines_agents()
         so.order_line.agent_ids._compute_amount()
         invoice.line_ids.agent_ids._compute_amount()
-        self.assertEqual(so.order_line.agent_ids.percent_amount, 5)
-        self.assertEqual(invoice.line_ids.agent_ids.amount, 50)
+
+        fixed_amounts = so.order_line.agent_ids.mapped("fixed_amount")
+        self.assertEqual(len(fixed_amounts), 1)
+        self.assertEqual(fixed_amounts[0], 20)
+
+        amounts = invoice.line_ids.agent_ids.mapped("amount")
+        self.assertEqual(len(amounts), 1)
+        self.assertEqual(amounts[0], 20)
 
         # Azure Spain Variant: Customizable Desk (CONFIG) (Steel, White) - Variant
         so = self._create_sale_order(self.product_4, self.azure)