apt.postgresql.org broken dependency?

Just tried upgrading and added the apt-postgresql.org repo to my
Debian server (on testing now) and I got some backages like barman
retained because some dependencies couldn't be satisfied.

Los siguientes paquetes tienen dependencias incumplidas:
 barman : Depende: python (< 2.7) pero 2.7.3-4 va a ser instalado
          Depende: python-argcomplete pero no va a instalarse

# apt-cache policy python-argcomplete
python-argcomplete:
  Instalados: (ninguno)
  Candidato:  0.3.3-1.pgdg60+1
  Tabla de versión:
     0.3.3-1.pgdg60+1 0
        500 http://apt.postgresql.org/pub/repos/apt/ squeeze-pgdg/main
i386 Packages
     0.3.3-1 0
         50 http://ftp.de.debian.org/debian/ unstable/main i386 Packages

Since when 2.7.3 isn't larger then 2.7.

If I use the Debian packages, everything installs without a problem.

--
Martín Marqués
select 'martin.marques' || '@' || 'gmail.com'
DBA, Programador, Administrador