Hello rbauctions,
With regard to your listing for the Nentendo Wii, you will need to select from eBay's list of product information that best fits your item in order to successfully post it to eBay. Some information about some of the product choices for the Nintendo Wii, PAL and NTSC are the 2 video formats. Generally, NTSC is America, Canada, and Mexico, PAL is many other countries. Hope that helps in determining the correct product information for your item.
As for the additional API Warning for your Atari product, eBay is simply letting you know that based on your listing information they were able to locate an exact entry in their product catalog that fits your listing and recommends that you include this product information in your listing.
If you need any further assistance with your Auctiva account, please contact our Customer Support team directly from under the "Help" tab within your account and we will do our best to assist you.
-Michael