Improve linkage report layout

modules/purchase_trade/tests/test_module.py

@@ -6562,7 +6562,17 @@ class PurchaseTradeTestCase(ModuleTestCase):
         ShipmentIn = Pool().get('stock.shipment.in')
         shipment = ShipmentIn()
         shipment.bl_date = datetime.date(2026, 4, 30)
-        shipment.fees = []
+        freight_product = SimpleNamespace(
+            rec_name='[Maritime Freight] Maritime freight',
+            name='Maritime freight')
+        shipment.fees = [
+            SimpleNamespace(
+                id=201, product=freight_product, price=Decimal('10'),
+                quantity=Decimal('1'), mode='lumpsum', p_r='pay'),
+            SimpleNamespace(
+                id=202, product=freight_product, price=Decimal('15'),
+                quantity=Decimal('1'), mode='lumpsum', p_r='pay'),
+            ]
         shipment.moves = []
         shipment.lotqt = []
 
@@ -6637,6 +6647,12 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertIn('Sales', shipment.report_linkage_summary_groups)
         self.assertIn('-8,000.000', shipment.report_linkage_summary_estimated)
         self.assertIn('10,000.000', shipment.report_linkage_summary_estimated)
+        summary_rows = shipment._get_report_linkage_summary_rows()
+        freight_rows = [
+            row for row in summary_rows
+            if row[0] == 'Costs' and row[1] == 'Maritime freight']
+        self.assertEqual(len(freight_rows), 1)
+        self.assertEqual(freight_rows[0][2], Decimal('-25'))
         self.assertIn('P-10', shipment.report_linkage_movement_references)
         self.assertIn('S-20', shipment.report_linkage_movement_references)
         self.assertIn('100 MT', shipment.report_linkage_movement_quantities)