CQM107E Invalid line command. Enter "D" to display data sets, or "S" to select interval.
The line command you specified on the Interval Selection panel is not valid. Valid line commands for the Interval Selection panel include D (displays the data sets for one or more intervals) or S (selects one or more intervals for viewing).
Specify either D (to display data sets for an interval) or S (to select an interval for viewing).