Hello and thank you for the reply. Unless I am missing something, there is no global location to add a new book. "Add New", is only located in each individual field. When chosen and completed (for any field), a grey "X" appears next to the field. When this happens, the "Next" button never highlights and you cannot progress further.
I've just been told by others that this has happened to them in the past. They were unable to solve it. They created an entry for a similar book and just wrote over it on the invoice. Should I do that?