If you sell via Vendor Central (versus the standard Seller Central), then you can overwrite it all. Vendor Central is when you sell directly TO Amazon, versus on Amazon. Amazon gives much more latitude to the sellers that provide them the product and consider them the authority, versus some guy who may be selling it out of his garage. The problem is, right, Amazon can't tell if you are a guy in his garage that picked up a bunch of these on a closeout or the actual brand owner. If you sell via Vendor Central they now consider you the brand owner and will allow you to make any changes you want to the existing listing.