Seeing this error? "You are attempted to upload codes that have already been uploaded to a different book"
This happens when you try to upload codes for a book that already has them. For example, if you accidentally upload the csv for "To Kill a Mocking Bird" to the wrong title, say "The Sun Also Rises" and then try to update them a few days later for the correct title, the system won't let you do that, because the code is associated with a different title.
To correct this, you have 2 options:
1) Figure out which books has the wrong codes. The My Books control panel lets you see which codes are assigned to which books.
2) Go into each book and click the "Delete all Promo Codes" button for each book and then once all your codes are zeroed out, start re-adding them.
We understand this is not ideal and are working on better messaging to inform you of where the error lies.