I'm doing something similar, except I want to make my autonumber go 1, 2, 3, 4, 5 etc, unless told otherwise and then go 2.1, 2.2, or 3.1, 3.2. This is for invoicing.
Rather than use autonumber can you not just use long integer and write code to make it behave like an autonumber. (surely that's...