Show Custom Message in WordPress Admin

add_action('admin_notices', 'my_custom_notice');
function my_custom_notice()
{
    global $current_screen;

    if ( 'my_post_type' == $current_screen->post_type )
        {
            echo "<h1>Whatever needs to be said</h1>";
        }
}

Put this in your functions.php or plugin file.
Replace ‘my_post_type’ with the name of your post type.

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