Проверка квитанции о покупке в приложении

Я хочу проверить получение транзакции в моем приложении,

Вот мой код,

- (void)recordTransaction:(SKPaymentTransaction *)transaction {

    NSData *receiptData = [NSData dataWithData:transaction.transactionReceipt];

    NSString *encodedString = [Base64 encode:receiptData];

     NSURL *url = [NSURL URLWithString:@"https://sandbox.itunes.apple.com/verifyReceipt"];

    ASIFormDataRequest *request = [[ASIFormDataRequest alloc] initWithURL:url];

    [request setPostValue:encodedString forKey:@"receipt-data"];

    [request setRequestMethod:@"POST"];

    [request setDelegate:self];

    [request startAsynchronous];

}

Я получение вывода:

{"status": 21002, "exception": "java.lang. , and within that class there I found a method named WithMany() with 2 overloads. The first overload: WithMany(...

I recently came by the class ManyNavigationPropertyConfiguration , and within that class there I found a method named WithMany() with 2 overloads.

The first overload: WithMany()

Configures the relationship to be many:many without a navigation property on the other side of the relationship.

The second overload: WithMany(Expression>>)

Configures the relationship to be many:many with a navigation property on the other side of the relationship.

Now is my question, why would you configure a relationship to be many:many without a navigation property (the first overload)? I dont see any scenarios where that would be helpful... Any thoughts?