Xcode App验证丢失密钥链访问警告

I am preparing to submit an update to an app that has been on the app store for a couple of years. I have since created new certificates and profiles. When I validate, I get a warning message saying the app indentity entitlement has changed resulting in a loss of key-chain access. I have not changed the bundle identifier. My app uses the keychain to store a username and password to validate an in-app purchase. I take it that the app will no longer be able to access this keychain item thus the app will not reconize the in-app purchase. If I have the user execute the Restore Purchases function, will they be charged again for the in-app or will ITunes still reconize the previous purchase? What determines this.I am preparing to submit an update to an app th