I did a YS1700 communication comparison on the YSS1000 but there was no mismatch. In the mismatch list there was "Symbol: USAGE", but what parameter is that?

USAGE shows usage of the model and suffix codes. -0xx are 2014/05 or earlier products, and -1xx and -2xx are enhanced versions sold in 2014/05. A mismatch occurs when YS1x00-0xx data is input to a YS of YS1x00-1xx or YS1x00-2xx. Upload data again from the YS on which you downloaded, and save it.