Management Class '<Unknown>'

Has anyone ever seen a directory or file obtain a management
class of '<Unknown>' ?

I've got several thousand directories that seem to have lost
their management class identity, and they now refuse to expire
and cause thousands of error messages in dsmerror.log every time
an incremental backup is run against the filesystem in which the
directories formerly resided.

It does appear to be limited to directories. Here is a sample of
the output from a 'dsmc q back' command (pardon the
non-wrapping):

Node Name: CHABAH
Session established with server DLADSM: AIX-RS/6000
  Server Version 3, Release 1, Level 1.5
  Server date/time: 11/03/1998 17:38:55  Last access: 11/03/1998
17:38:46

             Size      Backup Date        Mgmt Class A/I File
             ----      -----------        ---------- --- ----
            4,096  11/04/1997 21:04:35    DIRMC       I  /chabah11/POE/001
               93  11/04/1997 21:04:35    DIRMC       I  /chabah11/POE/002
               75  11/04/1997 21:04:35    DIRMC       I  /chabah11/POE/009
            4,096  11/04/1997 21:04:35    DIRMC       I  /chabah11/POE/011
                9  11/22/1997 23:05:29    DIRMC       I
 /chabah11/POE/013_3
               23  11/04/1997 21:04:35    DIRMC       I  /chabah11/POE/022
            4,096  11/04/1997 21:24:35    <Unknown>   A
 /chabah11/POE/001/029/OUTPUT2
              127  11/04/1997 21:29:50    <Unknown>   A
 /chabah11/POE/001/029/ol_1/uncorrected/ol_1.0001.tiled
           24,576  11/04/1997 21:29:50    <Unknown>   A
 /chabah11/POE/001/029/ol_1/uncorrected/ol_1.0001.tiled/0.tile
            4,096  11/04/1997 21:29:50    <Unknown>   A
 /chabah11/POE/001/029/ol_1/uncorrected/ol_1.0001.tiled/1.tile
            4,096  11/04/1997 21:29:50    <Unknown>   A
 /chabah11/POE/001/029/ol_1/uncorrected/ol_1.0001.tiled/2.tile


Errors in dsmerror.log are of this form:

11/03/1998 00:02:03 ANS1228E Sending of object
'/chabah11/POE/011/017/apebble/bpebble_matte.lvl/mb__10.drw' failed
11/03/1998 00:02:03 ANS1105E The management class for this
file does not have a valid backup copy group.
This file will not be backed up.


The client is an SGI IRIX 6.2, running ADSM 3.1.0.3, server is
AIX 4.2.1, running ADSM 3.1.1.5.

I'd love to hear if anybody else has encountered this problem.
I'm trying to expire these entries--I've even tried to recreate
dummy directories with the same names as the existing entries,
but am receiving the same errors.

 -- Tom

Thomas A. La Porte
DreamWorks Feature Animation
tlaporte AT anim.dreamworks DOT com