The Global Mirror RSESSION request was issued with a session number that is invalid. For ACTION(DEFINE) the SNBR specified is zero. For ACTION(UNDEFINE), the session number does not match a currently defined session number on the LSS where the command was issued.
The command is rejected.
Verify that the session number specified is correct. After making any changes or corrections, resubmit the request.
Peer-To-Peer Remote Copy (PPRC).