diff --git a/YLErpDAL/BLL/EodSettlement/RealtimePnlCalc.cs b/YLErpDAL/BLL/EodSettlement/RealtimePnlCalc.cs
index d3a5b788..1a2e485c 100644
--- a/YLErpDAL/BLL/EodSettlement/RealtimePnlCalc.cs
+++ b/YLErpDAL/BLL/EodSettlement/RealtimePnlCalc.cs
@@ -2328,6 +2328,31 @@ namespace YLErp.BLL.Eod
                 var clientBalance = clientBalances[0];
                 using (var db = new YLContext())
                 {
+                    //修改/复核已簿记交易（trade.id!=0）按增量口径校验：本笔自身已簿记的成交金额（期权费记录）
+                    //与初始预付金流水已计入现金结存、初始授信占用已计入已使用授信，比较前先剔除——
+                    //否则改备注等无关字段保存会被存量预付金二次拦截（例：入金60万、初始预付金已付50万、余额10万）。
+                    //只剔除确认时会重写的记录；追保/票息/平仓等生命周期记录确认后仍保留，不剔除。
+                    var ownCashBooked = 0d;
+                    var ownCreditBooked = 0d;
+                    if (trade.id != 0)
+                    {
+                        ownCashBooked = db.ClientCashInCashOut
+                            .Where(x => x.TradeId == trade.id && x.ValidState != "InValid")
+                            .ToList()
+                            .Where(x => (x.State == ClientCashInCashOut.已结算 || x.State == ClientCashInCashOut.已确认)
+                                && (x.Action == ClientCashInCashOut.系统操作_期权费 || x.Action == ClientCashInCashOut.系统操作_应付预付金))
+                            .Sum(x => x.Money ?? 0);
+                        ownCreditBooked = db.client_credit_inout
+                            .Where(x => x.trade_id == trade.id)
+                            .ToList()
+                            .Where(x => !Modules.SwapModule.ClientCreditInoutService.IsAdditionalMarginRecord(x))
+                            .Sum(x => x.amount);
+                        clientBalance.AmountFund -= ownCashBooked;
+                        clientBalance.AvailableAmount -= ownCashBooked;
+                    }
+                    var ownBookedNote = trade.id != 0
+                        ? $"（已剔除本笔已簿记资金{ownCashBooked:#,##0.000}与初始授信占用{ownCreditBooked:#,##0.000}）"
+                        : "";
                     var tradePrice = trade.TradePrice * (-TradeCalcHelper.GetSign(trade.BuySell));
                     var AvailableAmount = clientBalance.AvailablePremium();
 
@@ -2381,14 +2406,15 @@ namespace YLErp.BLL.Eod
                                 }
                             }
                             var usedCredit = Modules.SwapModule.ClientCreditInoutService.GetUsedCredit(clientId, db);
-                            var creditCap = Math.Max(clientBalance.TotalCredit - usedCredit, 0);
+                            //授信上限剔除本笔自身初始占用（ownCreditBooked，增量口径，见上方净扣说明）
+                            var creditCap = Math.Max(clientBalance.TotalCredit - (usedCredit - ownCreditBooked), 0);
                             var creditCovered = Math.Min(creditPayable, creditCap);
                             //授信覆盖不足的回落现金部分 + 走现金部分 + 成交金额，合计必须 ≤ 现金结存
                             var cashNeed = tradePrice + cashPayable + (creditPayable - creditCovered);
                             if (cashNeed > clientBalance.AmountFund)
                             {
                                 var totalPayable = tradePrice + cashPayable + creditPayable;
-                                errorMsg = $"当前交易应付总额：{totalPayable:#,##0.000}（走现金：{cashPayable + tradePrice:#,##0.000}，选授信：{creditPayable:#,##0.000}）。当前现金结存:{clientBalance.AmountFund:F3}（走现金部分只认现金结存），授信额度:{clientBalance.TotalCredit:F3}，已使用授信:{usedCredit:F3}，剩余授信:{creditCap:F3}（授信仅覆盖选授信部分，不足回落现金）。现金不足以覆盖应付的现金部分。";
+                                errorMsg = $"当前交易应付总额：{totalPayable:#,##0.000}（走现金：{cashPayable + tradePrice:#,##0.000}，选授信：{creditPayable:#,##0.000}）。当前现金结存:{clientBalance.AmountFund:F3}（走现金部分只认现金结存），授信额度:{clientBalance.TotalCredit:F3}，已使用授信:{usedCredit - ownCreditBooked:F3}，剩余授信:{creditCap:F3}（授信仅覆盖选授信部分，不足回落现金）。现金不足以覆盖应付的现金部分。{ownBookedNote}";
                                 return false;
                             }
                         }