Rsync on AIX w/ ACLS - Unsupported attribute value (124)

Question

Has anyone successfully used rsync to copy ACLs in AIX?

I'm having trouble convincing rsync to apply ACLs to files as root or otherwise. Googling, reading the source and docs have not helped so far. I always seem to get the error message

sys_acl_get_tag_type(): Unsupported attribute value (124).

Our rsync version is fairly recent, AIX 6.1, using a jfs2 filesystem, and I'm using a very simple test case (see below). The ACL in question seems pretty standard and simple.

What does unsupported attribute value mean? How can I get it supported? Anyone have any ideas on how to convince rsync to save and apply the acls to the destination?

$ /opt/freeware/bin/rsync -Aa /tmp/rtest/a/ /tmp/rtest/b/
rsync: change_sacl_perms: sys_acl_get_tag_type(): Unsupported attribute 
value (124)

$ /opt/freeware/bin/rsync --version
rsync  version 3.0.7  protocol version 30
Copyright (C) 1996-2009 by Andrew Tridgell, Wayne Davison, and others.
Web site: http://rsync.samba.org/
Capabilities:
    64-bit files, 32-bit inums, 32-bit timestamps, 64-bit long ints,
    socketpairs, hardlinks, symlinks, no IPv6, batchfiles, inplace,
    append, ACLs, no xattrs, no iconv, no symtimes

/tmp/rtest$ aclget ./a/file
*
* ACL_type   AIXC
*
attributes:
base permissions
    owner(bot403):  rw-
    group(staff):  r--
    others:  r--
extended permissions
    enabled
    permit   rwx     u:myuser
/tmp/rtest$ aclget ./b/file
*
* ACL_type   AIXC
*
attributes:
base permissions
    owner(bot403):  rw-
    group(staff):  r--
    others:  r--
extended permissions
    disabled

/tmp/rtest$ find . -ls
49166    1 drwxr-xr-x  4 bot403   staff          256 Nov 10 16:11 .
49167    1 drwxr-xr-x  2 bot403   staff          256 Nov 10 16:11 ./a
49169    0 -rw-r--r--  1 bot403   staff            0 Nov 10 16:11 
./a/file
49168    1 drwxr-xr-x  2 bot403   staff          256 Nov 10 16:11 ./b
49170    0 -rw-r--r--  1 bot403   staff            0 Nov 10 16:11 
./b/file