单据转换配置是携带不了多选基础资料的，只能通过二开，如下具体实现代码：
```
/// <summary>
/// 单据从源单到目标单已经转换完毕，输出最后的目标单数据包之前触发,
/// 此时，目标单数据包已经构建完毕，不会再有变动了
/// </summary>
/// <param name="e"></param>
/// <remarks>
/// 可以在此事件中，对目标单数据包进行最后的修订、补充
/// </remarks>
public override void AfterConvert(AfterConvertEventArgs e)
{
base.AfterConvert(e);
string tgtFieldKey = "Ftest1";
string srcFieleKey = "Ftest2";
if (e.Result == null)
return;
/*
* <0>仅支持单据头到单据头，其他自行处理
*/
MulBaseDataField tgtBaseDataField = e.TargetBusinessInfo.GetField(tgtFieldKey) as MulBaseDataField;
MulBaseDataField srcBaseDataField = e.SourceBusinessInfo.GetField(srcFieleKey) as MulBaseDataField;
if (tgtBaseDataField == null || srcBaseDataField == null)
return;
if (tgtBaseDataField.Entity.ElementType != Kingdee.BOS.Core.Metadata.ElementMetadata.ElementType.ELEMENTTYPE_BILLHEAD)
return;
if (srcBaseDataField.Entity.ElementType != Kingdee.BOS.Core.Metadata.ElementMetadata.ElementType.ELEMENTTYPE_BILLHEAD)
return;
/*
* <1>收集源单内码批量获取
*/
Entity tgtEntity = tgtBaseDataField.Entity;
var targetEntityObjs = e.Result.FindByEntityKey(tgtEntity.Key);
HashSet<object> srcPkIds = new HashSet<object>();
for (int i = 0, sz = targetEntityObjs.Length; i < sz; ++i)
{
var targetEntityRow = targetEntityObjs[i];
if (targetEntityRow.DataEntity == null)
continue;
//获取当前目标行的源单数据集合
var sourceEntityObjs = targetEntityRow["ConvertSource"] as List<Kingdee.BOS.Orm.DataEntity.DynamicObject>;
if (sourceEntityObjs == null)
continue;
foreach (var sourceObj in sourceEntityObjs)
{
if (sourceObj == null)
continue;
srcPkIds.Add(sourceObj[0]);
}
}
//<2>加载源单多选基础资料，这个地方由于是单据头可以直接取数
List<string> loadFields = new List<string>() { srcFieleKey };
Kingdee.BOS.Core.Metadata.BusinessInfo subBusinessInfo = e.SourceBusinessInfo.GetSubBusinessInfo(loadFields);
var srcBillObjs = Kingdee.BOS.ServiceHelper.BusinessDataServiceHelper.Load(this.Context, srcPkIds.ToArray(), subBusinessInfo.GetDynamicObjectType());
var srcBillObjsMap = srcBillObjs.ToDictionary((x) => { return x[0]; });
Dictionary<object, Kingdee.BOS.Orm.DataEntity.DynamicObject> baseDataObjCache = new Dictionary<object, Kingdee.BOS.Orm.DataEntity.DynamicObject>();
/*
* <3>将源单数据写到下游单据
*/
for (int i = 0, sz = targetEntityObjs.Length; i < sz; ++i)
{
var tgtEntityRow = targetEntityObjs[i];
if (tgtEntityRow.DataEntity == null)
continue;
//获取当前目标行的源单数据集合
var sourceEntityObjs = tgtEntityRow["ConvertSource"] as List<Kingdee.BOS.Orm.DataEnti
