Hi Howdy_McGee, thanks a lot for your reply.
At some point I figured it out that the problem was the missing id for new post.
So I did the following:
(probably not the best idea, but…)
(...)
if (isset($_POST['post_ID'])) {
//just like it was at first
$post_id = intval($_POST['post_ID']);
} elseif (isset($_POST['post_id'])) {
//just like it was at first
$post_id = intval($_POST['post_id']);
} elseif (isset($_REQUEST['item_id'])) {
// BECAUSE MY FORM COULD BE EDITING INSTEAD OF INCLUDING
$post_id = intval($_REQUEST['item_id']);
} else {
// I INVENTED AN ID FOR THIS NEW POST
$post_id = intval('9999999999999999');
}
//And since I couldnt check the post-type for a new post,
//I specified the post-type here (cause in my case this function only applies to this form)
$post_type = 'pt_publicacoes_doi';
$field_name = $field['name'];
(...)
