Rsync seems unable to copy even the most simple ACL on AIX and throws the error "Unsupported attribute value (124)"

$ /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(ebambach):  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(ebambach):  rw-
    group(staff):  r--
    others:  r--
extended permissions
    disabled


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