EDG8003I

Explanation
You requested that DFSMSrmm release a task tape
volume volser that DFSMSrmm does not manage.
In
the message text:
task
The job or started task.
volser
The volume serial number.

System action
The current volume request is not completed. The
requesting task, however, will have    completed its volume deletion
processing.

Operator response
Inform the system programmer.

System programmer response
If this volume and other tape volumes
that are used by the task are not managed by DFSMSrmm, you    can
avoid the EDG8003I messages by stopping the task from calling the
EDGDFHSM or  the  EDGTVEXT program interface. If this task is the
only caller of the EDGDFHSM program interface and the EDGTVEXT   
program interface, you can disable the DFSMSrmm processing by using
the    TVEXTPURGE(NONE) parmlib option.

Source
DFSMSrmm

Module
EDGDFHSM