Messages that begin with prefix ANE and are in range 4000-4999 originate
from the backup-archive client. These messages (or events) are sent to the
server for distribution to various event logging receivers.

The client may send statistics to the server providing information about a
backup or restore. These statistics are informational messages that may be
enabled or disabled to the various event logging receivers. These messages
are not published in this manual.

Messages that begin with prefix ANR originate from the server.

Messages that begin with prefix ANS originate from the backup-archive or
space management clients.

ANS messages that are in range 5000--5999 and 8000--8999 originate from the
administrative client.

Messages that begin with prefix ACO and are in range 0301--5203 originate
from the administrative client.
These are messages for Tivoli Data Protection Microsoft SQL Server.

This is copied out of the MESSAGES manual. From the message, it looks like
it originated from the B/A client. Try checking your ulimit setting per the
response of the message. In the future, for SERVER messages, you can from
the ADMIN command line client, type 'help ANXXXXXX' to display the message
along with user response if applicable. For client messages, you can from
the Backup / Archive command line client, type 'help' and follow the menu
options.