perhaps you could post the ISBN/title/author
I skip the search and then I type them myself.
They are in Greek! ;-) Here they are, in case it makes a difference:
Title: Φόβος κανένας - 29 μικροδιηγήματα
Author: Γιάννης Φάρσαρης
Description field: <<long text still in Greek>>
I get 4 red warnings "This value is required." at the bottom of the page.
Three of them are for the title, author and Category (each field has a red asterisk at the right side), but all of which I have filled. I can see the text I 've filled in.
The source field of the fourth error is unidentified.
I get no error for the ISBN field.
Whatever I type in the author and title fields, I still see the errors. Tried with latin characters as well, just in case. In addition to that, whatever I select in the categories, I still get the error.
P.S.: I checked my profile, just in case that the book is already registered despite the error. But it isn't. At least, it does not show up in my registered books.