差旅费报销单打开报错Object reference not set to an instance of an o...

差旅费报销单上新增了一个自定义字段，打开差旅费报销单后报错，但是只要点开BOS里面的差旅费报销单，保存一下，前台又正常了，一两个小时候又开始报错，就这样反复，很奇怪！哪位高人指点一下，跪谢！！！

发生时间：13:28:06
错误来源： Kingdee.BOS.Core
错误信息：Object reference not set to an instance of an object.
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调用堆栈：
at Kingdee.BOS.Core.Metadata.FieldElement.DecimalFieldAppearance.GetBindValue(ControlBindValueArgs arg)
at Kingdee.BOS.Core.Metadata.EntityElement.EntryEntityAppearance.GetRowBindValue(ControlBindValueArgs arg, String seqFieldKey, List`1 fieldsAp)
at Kingdee.BOS.Core.Metadata.EntityElement.EntryEntityAppearance.GetBindValue(ControlBindValueArgs arg)
at Kingdee.BOS.Web.DynamicForm.DataBinder.BindControlData(ControlAppearance ctl, Int32 row)
at Kingdee.BOS.Web.DynamicForm.DataBinder.BindControlData(ControlAppearance ctl)
at Kingdee.BOS.Web.DynamicForm.DataBinder.BindControlsData(List`1 list)
at Kingdee.BOS.Web.DynamicForm.DataBinder.BindControlData(ControlAppearance ctl)
at Kingdee.BOS.Web.DynamicForm.DataBinder.BindControlsData(List`1 list)
at Kingdee.BOS.Web.DynamicForm.DataBinder.UpdateView()
at Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.UpdateView()
at Kingdee.BOS.Web.Bill.BillView.UpdateView()
at Kingdee.BOS.Web.Bill.BillView.LoadData()
at Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.LoadData()
错误数据： System.Collections.ListDictionaryInternal