1. Go to the book on ReaderLinks
2. Click on the Book Details tab
3. Enter the ISBN 10 and the ISBN 13 for your Amazon paperbacks
4. Save
5. When you pull your sales data next you'll be able to assign the books
1. Assign the ISBN 10 and ISBN 13 for each of your paperbacks. You can find these on the books' product pages on Amazon. Be sure to save the updated information by clicking on the orange button.
2. Pull your historical data from Amazon KDP. You can do this by clicking on the "Start importing KDP historic data" link inside the ReaderLinks KDP Tool pop-up window (the link is just below the 15 minute countdown timer.
3. Check your reports to see if this fixed the issue.