增加了金额为负数的判断，金额不允许为负数

Bailun.DC.Services/FinanceReportServices.cs

@@ -451,7 +451,13 @@ namespace Bailun.DC.Services
                             item.before_balance = item.userable_amount;
                             item.end_balance = item.userable_amount;
                         }
-                        
+
+                        if (item.amount < 0 || item.amount_sales<0 || item.before_balance<0||item.userable_amount<0||item.withdraw_amount<0)
+                        {
+                            return "金额必须大于0";
+                        }
+
+
                         if (item.id <= 0)
                         {