Updater is using wrong path in Packagelist

[Tekkla]

Hi,

the Updater is using wrong entries from the APT Packageslist.

Something like

http://security.debian.org stable/updates/http://autoinstall.plesk.com//debian Release

seems to me to be wrong. But where can i correct the false entries?

I'm running Plesk 7.5.4 on Debian 3.1

Thx for Hints.