You can do it as a copy
But not as a scan,
<pure guess/conjecture>
likely because of piracy (think University text books)
Of course you could copy the textbook and scan the output of that, but from a legal standpoint, having the Book Scanning option is probably harder to defend legally, this way it can be passed off as "That isn't what was intended with the feature"
</pure guess/conjecture>
A workaround, <in the case of a booklet you created and printed with your own stuff, but after printing you lost the file, and need to scan the original output to save time instead of re-creating from scratch,> would be Build Job.
Now when you scan a page (remember to set the size of one page in the Layout adjustment tab)
After you scan a page you will get this, just keep hitting Program next segment and manually move the book side to side on the glass to scan the right page, when you get them all select Submit Job and it will create and transfer the pdf file.
