Debain Stable : Squeeze (not lenny)
Debian Testing: Wheezy (not squeeze)
Sid is still Sid.
http://wiki.scribus.net/canvas/Debian#1._Add_the_repositories_to_package_manager_software
So. Are simply the names wrong. or currently there is no wheezy build?
Thanks for the input.
I would just ignore codenames. Since in repo entries "stable", "testing" and "unstable" are used, correct packages should be installed for every respective edition.