manual create a task, but doesn't effective

[kin boster]

hi all
   I manual create a task for install openssh-server,named 123.desc in
debian lenny , and only have  123.desc in /usr/share/tasksel/,
   when i run tasksel for install openssh-server, it doesn't
effective,openssh-server doen't installed
here are my test and 123.desc file

  test:
  # tasksel -t
 debconf-apt-progress -- aptitude -q --without-recommends -o
APT::Install-Recommends=no -y install ~t^openssh-server$

  # tasksel --list-tasks
  u openssh-server        OpenSSH

  # tasksel --task-packages openssh-server
  openssh-server

  # tasksel --task-desc openssh-server
  This task provides OpenSSH

  here is 123.desc：
Task: openssh-server
Section: user
Relevance: 8
Description: OpenSSH
 This task provides OpenSSH
Key:
 openssh-server
Packages: task-fields

some advise?

best regards

boster