DFS2490A UNLOCK SYSTEM COMMAND REQUIRED BEFORE SHUTDOWN.

Explanation
 Following an XRF takeover, either the IMS /UNLOCK SYSTEM command
or the z/OS® Availability Manager
(AVM) UNLOCK command must be entered to purge I/O
tolerated data before IMS can
be shut down.

System action
 Shutdown command is rejected.

System programmer response
 Enter either the IMS /UNLOCK SYSTEM or the
AVM UNLOCK command.

Module
DFSICM30 