Update: 20.10.2013
Everything is running smoothly under iOS 7 now.
Don’t forget to update Cahsy-POS before you upgrade to iOS 7. And of cause, be on the secure side mailing you a close-day automatically including a backup of the database.

We tested our app on the pre-release version of iOS 7 and we already fixed a lot of errors due to huge changes of iOS 7.
We still can not guarantee 100% that no additional bugs will be discovered in the next days. That’s why we recommend to postpone the update of your system for a while.