public ResultMessage updUncheckedSend(ArrayList<SendCommodityPO> poList) {
		SendCommodityPO po;
		for(int i = 0; i < poList.size(); i ++) {
			po = poList.get(i);
			Iterator<SendCommodityPO> iter = sendList.iterator();
			SendCommodityPO s;
			while(iter.hasNext()) {
				s = iter.next();
				if(po.date.getTime() == s.date.getTime() && po.num == s.num && s.checked != po.checked) {
					s.checked = po.checked;
					break;
				}
			}
		}
		writeSendFile();
		return ResultMessage.update_success;
	}