```

fix(swap): 修复复利模式下部分平仓后EOD本金计算问题

- 在复利模式部分平仓场景中确保使用计算得出的复利本金
- 添加了针对复利重置日期部分平仓的单元测试验证
- 修复了EOD本金重置逻辑，避免复利计算被错误覆盖
- 确保CloseInterestPosition执行后保留正确的复利本金值
```

UnitTestProject/Modules/SwapModule/DealInterestsScenarioTest.cs

@@ -782,6 +782,40 @@ namespace YLErp.Modules.SwapModule
                 "The previous EOD identity must not be reset to a new position");
         }
 
+        [TestMethod]
+        public void DI_COMPOUND_RESET_PARTIAL_CLOSE_UsesCalculatedPrincipal()
+        {
+            const decimal remainingNotional = 500m;
+            const decimal compoundPrincipalAfterSevenDays = 500.958904m;
+            var closeDate = StartDate.AddDays(7);
+            var service = new StubEodPositionService
+            {
+                AutoInterests = new List<swap_flow_event>
+                {
+                    new swap_flow_event
+                    {
+                        InterestPrincipal = compoundPrincipalAfterSevenDays,
+                        InterestRate = FixedRate,
+                        InterestAmount = 0m,
+                        TdInterestAmount = 0m
+                    }
+                }
+            };
+            var td = CreateTrade();
+            var position = CreateInterestPosition();
+            position.InterestType = (int)InterestTypeEnum.复利;
+            position.interest_rest_days = 7;
+            var closeFlow = CreateSwapFlowEvent(closeDate, 0m);
+            closeFlow.EventType = (int)SwapFlowEventTypeEnum.平仓;
+
+            var result = service.ExecuteSaveAutoEodWithCloseInterestPosition(
+                CreatePreEod(closeDate.AddDays(-1), 0m), position, td, closeDate, null,
+                remainingNotional, 0m, new List<swap_flow_event> { closeFlow }, remainingNotional, false);
+
+            AssertDecimal(compoundPrincipalAfterSevenDays, result.TdInterestPrincipal,
+                "复利重置日部分平仓后，EOD 本金必须保留 CalcSwapInterests 计算的 7 天复利本金");
+        }
+
         [TestMethod]
         public void DI_MANUAL_PREPAY_PARTIAL_CLOSE_UsesHistoryPlusRemainingDailyInterest()
         {

YLErpDAL/Modules/SwapModule/SwapEodPositionService.cs

@@ -1381,6 +1381,7 @@ namespace YLErp.Modules.SwapModule
             newEodPayPosition.TdInterestPrincipal = interestModes.Contains(position.InterestMode)
                 ? position.InterestPrincipalFix
                 : position.InterestMode == (int)InterestModeEnum.标的期初全价
+                    && position.InterestType != (int)InterestTypeEnum.复利
                     ? posiNotionalValue
                     : interests.Count > 0 ? interests.First().InterestPrincipal : 0;
             if (interval != null)