InApp purchase subscription and Restore

I have a MacApp with a 1 year subscription. I can buy it, the purchase request for the buy shows up.

Like this:

NSSet *productIdentifiers = [NSSet setWithObject:@"Test"];
productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
productsRequest.delegate = self;
[productsRequest start];

this should work with the Delegate.

If a try to restore the InApp purchased subscription like this:

    NSLog(@"Restore Purchase");
    productIdentifiers = [NSSet setWithObject:@"Test"];
    productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
    [productsRequest setDelegate:self];
    [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
}

But the paymentQueueRestoreCompletedTransactionsFinished is not called.

If i purchase the subscription again it shows me the SKPaymentTransactionStateRestored has been selected. Is this so ok? I think it is a little bit irritating if the Purchase window appears again. Is the Purchase delegate the same as the restore delegate?

Rewards from Germany Sven.