xfce4 upgrade problem

[Les Gray <lgray@bigpond.net.au>]

I've been using until now the backport of xfce4.2.2 from corsac.net .
When I try to upgrade to the backports.org version this happens -

dort:~# apt-get -t sarge-backports install xfce4

...

The following packages have unmet dependencies:
xfce4
Depends: xfwm4-themes (>= 4.2.3-1) but 4.2.3-0bpo2 is to be
installed
Depends: xfce4-panel (>= 4.2.3-1) but 4.2.3-0bpo2 is to be
installed
Depends: xfdesktop4 (>= 4.2.3-1) but 4.2.3-0bpo2 is to be installed
Depends: xffm4 (>= 4.2.3-1) but 4.2.3-0bpo2 is to be installed
Depends: xfce4-utils (>= 4.2.3-1) but 4.2.3-0bpo2 is to be
installed
Depends: xfce4-session (>= 4.2.3-1) but 4.2.3-0bpo2 is to be installed
E:Broken Packages

I think the problem may have something to do with the xfce4
metapackage. All the other new xfce4 packages are at 4.2.3-0bpo2, but
the metapackage is not -

dort:~# apt-cache policy xfce4
xfce4:
  Installed:4.2.2
  Available Versions:4.2.2bpo2
  Versions-Tabelle:
     4.2.2bpo2 0
        200 http://www.backports.org sarge-backports/main Packages
 *** 4.2.2 0
        100 /var/lib/dpkg/status
     4.0.5-1 0
        500 http://ftp.au.debian.org stable/main Packages

I was able to get around the problem (in a way) by changing the
pin-priority of all backports.org packages to '999'
in /etc/apt/preferences, then running 'apt-get dist-upgrade'. This
installed all the new packages but I am of course left with a broken
xfce4 metapackage.

It looks like it may be safe to remove 'xfce4' but I haven't tried it
yet. Although doing a 'dist-upgrade' gave me the new xfce4 desktop it's
obviously not the most elegant way of going about it.
 
Shouldn't you be able to just run 'apt-get -t sarge-backports install
xfce4' and have it upgrade seamlessly? It did that with
'x-window-system-core' (xf86 > xorg) without any trouble...