Problem setting POST_MAX

[Rolf Schaufelberger]

Hi, 

when I try to set POST_MAX to a higher value I get 

Conflicting information. 

I've a mod_perl / Mason app with an own hander, starting with 
(mod_perl2) 

sub handler () :method {
    my $class = shift;
    my $r     = shift;
    my ($app, $return);

    my $args = $ah->request_args( Apache2::Request->new($r), 
        POST_MAX => 200 <<20);
    ....
}

I've also tried to set it via read_limit()  with the same result.
What's wrong ?

rolf