Doesn't work if there is a required field

Interesting finding! Can you provide some more information with exactly what went wrong? Do you see any error messages in any logs or anything?

To help version 6.x-1.x move forward, please see this issue: #526936: Find best way to proceeding with 6.x-1.x and more specifically this comment: http://drupal.org/node/526936#comment-4931548