Hi Serjio,
Here is what I was told…
All binaries should support IAP.
When you try to update your app with IAP you might see that error because you are modifying the binary instead of deleting.
You should try to delete (not modify) the binary in the Update that you are working on and try to upload the updated version with IAP.
Can you try that and let us know if it is successful or not.
Ron
Samsung Developer Program