DFS3028A UNSUCCESSFUL OPEN OF ddname DATA SET
Explanation
The system could not open the data set identified in the message text by ddname.
System action
The step is abnormally terminated with abend 0310.
Programmer response
Perform IMS backout facility to undo changes made in step 2 of Partial Database Reorganization (PDBR). Ensure that DD statements for this data set are included, and specifications are correct.