I have the intention to create a custom online case form for our customers to use to register their warranty. I already have a custom record that stores all valid serial numbered items that are viable for warranty. This custom record is automatically created when the customer is invoiced. Therefore, it contains invoice details.

Now, the customer wanting to get their items warranted are not necessarily the same people we are invoicing, so I cannot use the the customer details. Therefore, we require a custom form for people to fill out. I dabbled with the idea of using the custom record's own online form feature. However, the problem with that is that customers can input the wrong serial number and create records, or they could overwrite an existing record. Therefore, I've gone with the idea of using cases.