配置采购申请单下推其他入库流程，报错。

配置采购申请单下推其他入库流程，报错。版本：5.0

[{"operation":"BOS_ConvertOpForm.BClick.FBTNOK."}]
发生时间：13:44:00
错误来源： mscorlib
错误信息：Object reference not set to an instance of an object.
===================================================
调用堆栈：

Server stack trace:
at Kingdee.BOS.App.Core.Convertible.MappingHelper.MappingField.MappingValue()
at Kingdee.BOS.App.Core.Convertible.DefaultPolicy.FieldMappingAction.MappingValue(ExtendedDataEntity extEntity, IMappingField mapping, Field targetField, Object mapValue, Object sourceOrgBDId)
at Kingdee.BOS.App.Core.Convertible.DefaultPolicy.FieldMappingAction.Do()
at Kingdee.BOS.Core.BusinessPolicyModel.BusinessPolicyEngine.Do(OperateOption context)
at Kingdee.BOS.App.Core.Convertible.ConvertEngine.OnCreating(PushArgs pushArgs, OperateOption option)
at Kingdee.BOS.App.Core.ConvertService.Push(Context ctx, PushArgs serviceArgs, OperateOption option, Boolean validPermission)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Kingdee.BOS.Contracts.IConvertService.Push(Context ctx, PushArgs serviceArgs, OperateOption option, Boolean validPermission)
at Kingdee.BOS.ServiceHelper.ConvertServiceHelper.Push(Context ctx, PushArgs serviceArgs, OperateOption option)
at Kingdee.BOS.Business.Bill.Operation.Push.DoPush(OpFormReturnInfo retInfo, ListSelectedRow[] thisViewSelectedRows, ListSelectedRow[] selectedRows)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.DoCallBackAction(Object returnData, Action`1 action)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.FormClosedCallBack(String id, Boolean isSyncCall)
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.CloseWindow()
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.OnClose()
at Kingdee.BOS.Business.DynamicForm.ConvertPlugIn.ConvertOpFormEdit.ButtonClick(ButtonClickEventArgs e)
at Kingdee.BOS.Core.DynamicForm.PlugIn.DynamicFormViewPlugInProxy.FireButtonClick(ButtonClickEventArgs e)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.ButtonClick(String key, String menuKey)
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.ButtonClick(String buttonKey, String menuKey, JSONArray postDatas)
错误数据： System.Collections.ListDictionaryInterna