Search by requestor always empty

I have installed rt-2-0-9 on Linux box SuSe 7.2 Kernel 2.4.13

Webserver version:

[ Apache/1.3.19 (Unix) (SuSE/Linux) mod_layout/1.0 mod_throttle/3.0
mod_fastcgi/2.2.2 PHP/4.0.4pl1 mod_perl/1.25 mod_dtcl ]
Installed modules:
[ PHP4 module ]
[ Apache perl module (mod_perl) ]
[ Apache DAV module (mod_dav) ]

Perl 5.6.0

Used database Postgres SQL 7.0.3

When i make a search of ticket by requestor the result is always empty.
anyone can help me ?

Philippe Van Hecke