自定义单据配置了一个单据转换，生成采购入库单，审核时出现这个问题。之前操作没有问题，突然冒出了这个问题。确定后，单据显示 审核成功，且能查到对应库存。这是啥错误啊
[{"operation":"STK_InStock.MBIClick.tbSplitApprove"}]
发生时间：15:29:05
错误来源： Kingdee.BOS.ServiceHelper
错误信息：Object reference not set to an instance of an object.
===================================================
调用堆栈：
Server stack trace:
at Kingdee.K3.FIN.AP.App.ServicePlugIn.InStockToPayableWhenAudit.OnInitTargetBillWithConvertRuleDic()
at Kingdee.K3.FIN.App.Core.AbstractOperationProduceBill.OnInit(DynamicObject[] objs)
at Kingdee.K3.FIN.App.Core.AbstractOperationProduceBill.AfterExecuteOperationTransaction(AfterExecuteOperationTransaction e)
at Kingdee.BOS.App.Core.PlugInProxy.OperationServicePlugInProxy.FireAfterExecuteOperationTransaction(AfterExecuteOperationTransaction e)
at Kingdee.BOS.App.Core.AbstractOprerationService.DoExcete()
at Kingdee.BOS.App.Core.AbstractOprerationService.Excute(Object[] ids)
at Kingdee.BOS.App.Core.AbstractSetStatus.Excute(Object[] ids)
at Kingdee.BOS.App.Core.SetStatusService.SetBillStatus(Context ctx, BusinessInfo businessInfo, List`1 pkEntryIds, List`1 paras, String operationNumber, OperateOption option)
Exception rethrown at [0]:
at Kingdee.BOS.ServiceHelper.BusinessDataServiceHelper.SetBillStatus(Context ctx, BusinessInfo businessInfo, List`1 pkEntryIds, List`1 paras, String operationNumber, OperateOption option)
at Kingdee.BOS.Business.Bill.Operation.AbstractStatusConvert.ExecuteBillOperation(List`1 paras, OperateOption option)
at Kingdee.BOS.Business.Bill.Operation.AbstractStatusConvert.ExecuteStatusConvert(List`1 paras)
at Kingdee.BOS.Business.Bill.Operation.Audit.AuditIdeaPrompt()
at Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Operation(CallBackWfAfterOperation callbackwf, IOperationResult result)
at Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Execute(InvokeFormOperation4WfParam param, CallBackWfAfterOperation callbackwf)
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.InvokeFormOperation(String operationNumber)
at Kingdee.BOS.Business.DynamicForm.BusinessService.ExcuteOperation.DoAction(FormBusinessServiceArgs e)
at Kingdee.BOS.Core.DynamicForm.FormBusinessServiceUtil.InvokeServices(IDynamicFormView view, Object source, IEnumerable`1 services, Int32 actionType, String activeEntity, DynamicObject activeRow, Int32 rowIndex)
at Kingdee.BOS.Web.DynamicForm.BusinessServiceCaller.InvokeFormBusiness(IDynamicFormView view, Object source, List`1 formBusinessServices, Int32 actionType, String entityKey, Int32 row)
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
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