You do not see values for those fields because on Amazon Marketplace
you can only sell items that Amazon already sell's. Providing an ASIN
will link to all these details that already exist on Amazon like
Product name and Description, you can't override them. On
SellerCentral you can specify your own name, price, shipping model
etc. They both cost £25 a month and some people switch to
SellerCentral due to its more flexible nature.