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My inapp purchase is on "Ready to Submit" status but the button of "Submit for review" is grey out? Is there any reason why I cannot submit for review? Thank you very much

My app is selling 2 in-app products (A and B). Assume a user only purchase product A. Is there a way to restore just product A transaction? It seems to me that there is noway to restore just one transaction. Example: (IBAction)restoreproduct:(id)sender {     if ([SKPaymentQueue canMakePayments]) {         [[SKPaymentQueue defaultQueue] addTransactionObserver:self];         [[SKPaymentQueue defaultQueue]restoreCompletedTransactions];     } else {         NSLog(@"Fail");     } }