@page: Invalid number : size Property size doesn't exist : portrait

My print.css contains a @page statement 
(http://www.orpatec.ch/turniere/5erfussball/print.css) which produces 
the error "Invalid number : size Property size doesn't exist : portrait" 
but when I go to the reference 
(http://www.w3.org/TR/REC-CSS2/page.html#propdef-size) it seems to be 
correct. Is my @page statement wrong or is the css validator wrong?

O. Wyss

Received on Sunday, 25 February 2007 17:58:14 UTC