I have purchased and installed cubasis 2 on my iPad and in-app purchases. I also bought Cubasis 3 and successfully performed CUBASIS IN-APP PURCHASE TRANSFER. I have also installed Cubasis 3 on my iPhone, but here the in-app purchase transfer fails. Cubasis writes: NOTHING TO RESTORE. Both devices are of course on the same Apple ID and I try it on the iPhone through the RESTORE PURCHASES option, because Cubasis 2 is not available for iPhone and it is not possible to use the CUBASIS IN-APP PURCHASE TRANSFER function.
I searched the web for various discussion forums, but found no solution. Thank you for the advice.