我有个疑惑，哪为大哥大姐解释一下

本人报完名后，在查询注册信息中的ETS注册号上显示在向在向ETS更新数据时出错：
Error:Test date received in the transaction is the same as a preexisting test appointment date for the same profile

拜请大哥们告诉我是怎么回事啊？