The command indicated specifies the name of a data storage volume that is currently in use.
The server does not process the command.
Verify that the volume is unavailable by issuing the QUERY VOLHISTORY command. If the volume is listed in the command output, then it is being used and unavailable. Wait until the conflicting volume activity has completed, and then retry this operation. If the volume is currently mounted, but idle, dismount it using the DISMOUNT VOLUME command, and then retry the operation.