【常见问题】
单据下查提示单据不存在，且打开上机操作日志仅有调用下推操作的记录，没有下游单据保存、删除的记录。
【原因】因取消事务导致的数据不一致性问题；
操作事务被取消，操作中的执行顺序：BeginOperationTransaction->创建源单关联关系->反写源单并保存源单->保存当前单据数据包->调用操作上的服务（如自动下推）->EndOperationTransaction
在执行过程中如果出现异常，不会回滚保存的关联关系数据
【案例演示】采购申请单到采购订单保存，采购订单保存因反写异常中断事务，但是关联关系保存成功
(0)采购申请单增加复选框字段，用作反写规则，设置超额控制
(1)采购订单，表单插件或者服务插件，增加取消事务的逻辑
```csharp
using Kingdee.BOS.Core.Bill.PlugIn;
using Kingdee.BOS.Core.DynamicForm.PlugIn;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;
using System;
namespace DynamicFormPlugIn.Operation
{
[Kingdee.BOS.Util.HotUpdate]
[System.ComponentModel.Description("操作服务插件，取消事务")]
public class OperationServicePlugIn_CancelTransaction : AbstractOperationServicePlugIn
{
public override void OnPrepareOperationServiceOption(OnPrepareOperationServiceEventArgs e)
{
//是否启用事务，设置为false 不启用
e.SupportTransaction = false;
}
}
[Kingdee.BOS.Util.HotUpdate]
[System.ComponentModel.Description("表单插件，取消事务")]
public class FormPlugIn_CancelTransaction : AbstractBillPlugIn
{
public override void BeforeDoOperation(BeforeDoOperationEventArgs e)
{
if (string.Equals(e.Operation.FormOperation.Operation, "Save", StringComparison.OrdinalIgnoreCase))
{
//是否忽略事务，设置为true 代表忽略
e.Option.SetVariableValue("IgnoreTransaction", true);
}
}
}
}
```
(2)运行效果
【说明】强烈不建议外部使用取消事务的逻辑，容易导致数据不一致的问题；
如果强制要使用该参数，需要按以下逻辑记录
(0)上机操作日志中增加记录，标记对应单据的操作为取消事务的逻辑，以及取消标记的代码地址
(1)操作失败时写上机操作日志，标记操作失败，以便排查数据不一致的原因
```csharp
using Kingdee.BOS.Core.Bill.PlugIn;
using Kingdee.BOS.Core.DynamicForm.PlugIn;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;
using Kingdee.BOS.Core.Log;
using Kingdee.BOS.Util;
using System;
using System.Collections.Generic;
namespace DynamicFormPlugIn.Operation
{
[Kingdee.BOS.Util.HotUpdate]
[System.ComponentModel.Description("操作服务插件，登记是否取消事务了")]
public class OperationServicePlugIn_LogCancelTransaction : AbstractOperationServicePlugIn
{
public override void OnPrepareOperationServiceOption(OnPrepareOperationServiceEventArgs e)
{
if (e.SupportTransaction == false)
{
List<LogObject> lstLogObject = new List<LogObject>();
var subSysId = this.Option.GetVariableValue("BOS_Operation_OpenParameter_SubSystemId", string.Empty);
var logObj = new LogObject()
{
Description = "当前操作事务被取消",
OperateName = this.FormOperation.OperationName,
ObjectTypeId = this.BusinessInfo.GetForm().Id,
SubSystemId = subSysId.IsNullOrEmptyOrWhiteSpace() ? this.BusinessInfo.GetForm().SubsysId : subSysId,
Environment = OperatingEnvironment.BizOperate,
};
lstLogObject.Add(logObj);
Kingdee.BOS.ServiceHelper.LogServiceHelper.BatchWriteLog(this.Context, lstLogObject);
}
}
}
}
```
```python
import clr
clr.AddReference("mscorlib")
clr.AddReference("System.Data")
#本次引用
clr.AddReference("Kingdee.BOS")
clr.AddReference("Kingdee.BOS.Core")
clr.AddReference("Kingdee.BOS.ServiceHelper")
from System import *
from System.Collections.Generic import *
from System.Data import *
##本次引用
from Kingdee.BOS.Core.DynamicForm.PlugIn import *
from Kingdee.BOS.Core.DynamicForm.PlugIn.Args import *
from Kingdee.BOS.Core.Log import *
from Kingdee.BOS.ServiceHelper import *
from Kingdee.BOS.Util import *
def OnPrepareOperationServiceOption(e):
if e.SupportTransaction == True:
return;
lstLogObject = List[LogObject]();
logObj = LogObject();
logObj.Description = '当前操作事务被取消py';
logObj.OperateName = this.FormOperation.OperationName;
logObj.ObjectTypeId = this.BusinessInfo.GetForm().Id;
logObj.SubSystemId = this.BusinessInfo.GetForm().SubsysId;
logObj.Environment = OperatingEnvironment.BizOperate;
lstLogObject.Add(logObj);
LogServiceHelper.BatchWriteLog(this.Context, lstLogObject);
```
