While creating a new version for my app, I set it up on iTunes Connect and filled in the binary details. During this process I added that I did not use add advertising in my app, however I do use advertising SDKs to track my conversion and other analytics.
Anyway, when validating my app, I get an error saying
Improper Advertising Identifier Usage. Your app contains the Advertising Identifier [IDFA] API but you have not indicated its usage on the Prepare for Upload page on iTunes Connect.
How do I go back and change the Prepare for Upload details? Or a way of cancelling this update and starting again?
You have to upload an empty app like in this tutorial and call it like your app. http://www.youtube.com/watch?v=VBMXdfFqSYM
Then click on binary settings in iTunes Connect and click on "reject binary". After that you can reenter the IDFA section on the "prepare for upload" page.
This is a workaround. Apple has to fix this problem in the future.