+ my $sort_url = build_std_url('action=show_dunning', grep { $form->{$_} } @filter_field_list);
+
+ foreach my $name (qw(dunning_description customername invnumber transdate duedate dunning_date dunning_duedate salesman)) {
+ my $sortdir = $form->{sort} eq $name ? 1 - $form->{sortdir} : $form->{sortdir};
+ $column_defs{$name}->{link} = $sort_url . "&sort=$name&sortdir=$sortdir";
+ }