WP: Filter 'Enter title here' text in title field of edit post admin screen to show something different

filter_enter_title_here.php

<?php

// New 'Enter title here' text for custom post type
add_filter('enter_title_here', 'intw_filter_enter_title_here');
function intw_filter_enter_title_here( $message ) {
	global $post;
	if ('POSTTYPE' == $post->post_type) {
		$message = 'NEW MESSAGE';
	}
	return $message;
}