Item required "doesn't feature the required functionality"

Hello There.

We just tried to start publishing or first (simple) php Script, but we got this message:
“This item has a nice concept, but doesn’t feature the required functionality and features to be approved as a premium item.”

There are some questions, that come up.

  1. What is “Premium Item”. Is there any other “type” of item?
  2. What does mean the required functionality? Is there any List of req Functions?

We created a php script, which allows the user to create simple googleMaps with Multimarkers and every settings. Also we added “Smarty” Framework support.