客户在应收单获取成本的时候报错：An item with the same key has already been added.
[{"operation":"AR_receivable.MBIClick.TB_GETCOSTINFO"}]
发生时间：14:04:30
错误来源： mscorlib
错误信息：An item with the same key has already been added.
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调用堆栈：
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Kingdee.K3.FIN.App.Core.IVCommonService.GetCostData(Context ctx, List`1 param)
at Kingdee.K3.FIN.ServiceHelper.IVCommonServiceHelper.GetCostData(Context ctx, List`1 param)
at Kingdee.K3.FIN.AR.Business.PlugIn.ReceivableEdit.GetCostInfo()
at Kingdee.K3.FIN.AR.Business.PlugIn.ReceivableEdit.BarItemClick(BarItemClickEventArgs e)
at Kingdee.BOS.Core.DynamicForm.PlugIn.DynamicFormViewPlugInProxy.FireBarItemClick(BarItemClickEventArgs e)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.BarItemClick(String parentKey, String barItemKey, BarDataManager bar, Int32 bartype)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.MainBarItemClick(String barItemKey)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.MainBarItemClick(String itemKey, JSONArray postDatas)
错误数据： System.Collections.ListDictionaryInternal
目前发现只有一张应收单是这个情况，已经自己检查过了，没有发现字段名重复，请问还可能有其他什么情况导致这个报错？
版本：K3CLOUD6.1
补丁：PT108346
QQ: 501599926