Once you finish the transaction of CONSUMABLE IN-APP the following method will fire there add this statement "[[SKPaymentQueue defaultQueue] finishTransaction:transaction]" to remove the purchased product.Using this statement you can avoid the alert message(I bought it earlier but was not downloaded).
-(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
for (SKPaymentTransaction *transaction in transactions)
{
switch (transaction.transactionState) {
case SKPaymentTransactionStatePurchased:
if (transaction.downloads)
{
[[SKPaymentQueue defaultQueue]
startDownloads:transaction.downloads];
} else {
//Add the following line to remove purchased observer
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}
break;
case SKPaymentTransactionStateFailed:
[[SKPaymentQueue defaultQueue]
finishTransaction:transaction];
break;
}
}
}