Are you able to delete the output for a specific DD from the Data Set List panel?
Release : 14.0
Component : View
Upon using "?" on a report, and being presented the Dataset List panel, the valid line commands are "E", "J", "JA", "P", "PA", and "S".
With that, neither "D" nor "DD" can be used.
To delete a report, it needs to be done at the top level and the entire report is deleted.