The invoice has a copy of the customer record at the time of its creation or at some latter point when the details of billing or shipping are finalized. This co

The invoice has a copy of the customer record at the time of its creation or at some latter point when the details of billing or shipping are finalized. This copy is never updated. The invoice also has a reference to the customer's current record. If the customer's name were updated, this current record would be updated, but the copy in the invoice would not be.