Here's the list of things I'm unsure about on the Muse forms. Please let me know which are important, in what context and specifically what needs to be provided. (In other words, if I'm asking about it, I'm clueless about what it is!)

EAN-13 Number (Referral Link gives error message)
UPC Code (Referral Link gives error message)
BIC main subject category
BIC subject category version number
Territorial rights
Supplier SAN
Supplier name
Availability status code
Expected availability date
Unpriced item type