Attachment Problem

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I created a custom upload field with WCK and select attach upload to post.
but my uploads don’t attach to post so the codes in below not working.

$attachment = get_children(array('post_parent' => $post->ID, 'post_type' => 'attachment', 'post_mime_type' => 'image'));
					if ($attachment) {

Note: An upload field that created before this field is still working. Please help…