Xcode 4.0.2 duplicated pulldown in Project settings -> Code Signing

In Xcode 4.0.2, I click on the project file to bring up the project settings

I then select either my target or my project from the left pane of the newly opened settings page

I then select the ' build settings ' tab bar, and scroll down to ' code signing '

I get

I don't understand why each entry is duplicated. 开发者_Go百科Can someone explain to me in plain English what is going on here?

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Okay, so there's 2 sections in the Code Signing Identity window:

• Debug
• Release

It is not uncommon for a developer to have various iOS SDKs installed on their Mac - in this situation, it may be necessary for them to have a specific profile per iOS SDK version. The window you see would allow a developer to do this, for both debug and release versions of an app - be it for iOS or Mac.

Hope this helps!