I'm working on an app that will allow sales reps to write an invoice in the field. As such, I've used the Get (UUID) function for the primary key for all tables.
As I'm working with the invoice file I'm thinking folks will want a reference number (invoice number) as well (a 16 character UUID is evidently not going to work).
What is considered good practice with such things? I've searched through the advanced training guide and came up empty.