DDDL syntax I used to delete about 967 obsolete pre-R16 messages. Also a couple of CREPORTS I wrote to analyze the messages. I used the output of the system report to spot date ranges of messages that were obsolete and created the delete syntax from there. Use with care, but I haven't missed any of these messages so far. I believe there are also some R16 messages obsoleted by R17 but will leave the chapter for the sequel.