I have US account for iTunes where I do all of my purchases. Once my account had some problems , at the same time I needed Omnofocus for iPhone badly- so I purchased from Estonian appstore. Now I have situation where all other apps are from US account and only Omnifocus from Esronian. In that situation I cannot update my iPhone any more as I would lose Omnifocus. Is there possibility to change authorization of Omnifocus to be part of US account?