EDG3284I

Explanation
You attempted to change the external volume name
(the rack number) for a volume that is resident in a system-managed
tape library. DFSMSrmm does not support the changing of a volume's
external label while it is in a library.

System action
The subcommand fails.

Programmer response
To change the rack number, you first have
to eject the volume by using the RMM CHANGEVOLUME subcommand with
the EJECT operand.
If you change the external volume serial
number the volume is no longer accepted in a system-managed tape library
because the internal and external volume serial numbers must be the
same.

Source
DFSMSrmm

Module
EDGMTSO

Routing code
11

Descriptor code
7