rss feed 2.0 – feed.php change permalink

Hi,

in my wordpress blog I have changed the link to a post with a custom field calls “url”, what keeps the link to the post.

To be able to use the rss feed I would like to change in the feed.php

function the_permalink_rss() {
	echo apply_filters('the_permalink_rss', get_permalink());
}

the get_permalink() with the custom field “url”.

I tried to replace “get permalink()” with “get_post_custom_values(“url”)” but it doesn’t work.

I also tried to change the function into

function the_permalink_rss() {
        $values = get_post_custom_values("url");
	echo apply_filters('the_permalink_rss', $values[0]);
}

Doesn’t work either.

Somebody know the solution? thanks

Jarod
Wordpress 2.7