iPhone AdHoc Provisioning Tip

Has anyone experienced problems with AdHoc provisioning on iPhone SDK 4?
I had a problem that took me while to overcome. Each time I dragged my app into iTunes I got a message saying:

"A provisioning profile named embedded.mobileprovision already exists on this computer. Do you want to replace it?"

I had a perfectly working setup to create AdHoc distributions of iPhone apps. What has changed?
The only difference was that I created a new Target within the same project. Luckily, I had one target that still worked as AdHoc built. I could boil it down to a missing property in info.plist of the new target.
Adding LSRequiresIPhoneOS and setting it to true did the trick.

If you have a similar problem please check out also this blog entry.