Mtm bug

modules/purchase_trade/tests/test_module.py

@@ -80,8 +80,8 @@ class PurchaseTradeTestCase(ModuleTestCase):
             strategy.get_mtm(line, Decimal('10')),
             Decimal('250.00'))
 
-    def test_get_strategy_mtm_price_returns_unit_price(self):
-        'strategy mtm price exposes the raw unit valuation price'
+    def test_get_strategy_mtm_price_applies_component_ratio(self):
+        'strategy mtm price applies component ratios'
         strategy = Mock(
             scenario=Mock(
                 valuation_date='2026-03-29',
@@ -99,7 +99,36 @@ class PurchaseTradeTestCase(ModuleTestCase):
 
         self.assertEqual(
             valuation_module.Valuation._get_strategy_mtm_price(strategy, line),
-            Decimal('100.0000'))
+            Decimal('25.0000'))
+
+    def test_get_strategy_mtm_price_keeps_signed_component_spread(self):
+        'strategy mtm price keeps signed spread between different components'
+        strategy = Mock(
+            scenario=Mock(
+                valuation_date='2026-03-29',
+                use_last_price=True,
+            ),
+            currency=Mock(),
+        )
+        strategy.components = [
+            Mock(
+                price_source_type='curve',
+                price_index=Mock(get_price=Mock(return_value=Decimal('120'))),
+                price_matrix=None,
+                ratio=Decimal('100'),
+            ),
+            Mock(
+                price_source_type='curve',
+                price_index=Mock(get_price=Mock(return_value=Decimal('80'))),
+                price_matrix=None,
+                ratio=Decimal('-100'),
+            ),
+        ]
+        line = Mock(unit=Mock())
+
+        self.assertEqual(
+            valuation_module.Valuation._get_strategy_mtm_price(strategy, line),
+            Decimal('40.0000'))
 
     def test_sale_line_is_unmatched_checks_lot_links(self):
         'sale line unmatched helper ignores empty matches and detects linked purchases'

modules/purchase_trade/valuation.py

@@ -356,6 +356,9 @@ class ValuationBase(ModelSQL):
                 value = Decimal(strategy._get_matrix_price(
                     comp, line, scenario.valuation_date))
 
+            if comp.ratio:
+                value *= Decimal(comp.ratio) / Decimal(100)
+
             total += value
 
         return round(total, 4)