The CA Datacom® Messages guide has been updated to include the missing DB00319I definition as follows:
DB00319I LXX DYNAMIC EXTEND - DELAY NEXT, CDCL NOT SET
This message occurs if the LXX was successfully extended with extra space and new log records caused the LXX to be at its wrap point. However, currently this log is a Source for CDC and the CDC Listener (CDCL) has not acknowledged it is aware of the extend. Also that it has not done needed preparation to allow new log records into the expanded space. The extend cannot be completed successfully at this time. It is checked at the next and all succeeding wrap points.
None. The message is informational only. The extend completion is checked again at the next wrap point.