DFS3961I THE REQUESTED PST IS EITHER A SYSTEM PST OR A DPST THAT HAS NEVER BEEN USED

Explanation
 The IMS Offline Dump Formatter DPST option
found a PST to satisfy a request, but was unable to confirm its DPST/SYSPST
status. If an unused DPST was selected, this condition is valid. But
an invalid request for a system PST under the DPST formatting option
might have caused this condition.

System action
 The request is terminated, and DPST option formatting
continues with the next request.

User response
 Ensure that all DPST formatting requests are
valid. You can format the requested PST as a SYSTEM PST. For assistance,
see the IMS system programmer.