Simulation movement are returned multiple times by this ZSQL Method.
For now, only fix it with adding DISTINCT as argument of SELECT.

This solution is not enough good, because it increase the request can become to
big for MySQL.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4241 20353a03-c40f-0410-a6d1-a30d3c3de9de