"Keith Wilby" wrote in message
...

OK I may well be being a bit thick here but the OP stated "This is a
7-digit number (no alphas) where 8146614 is my first Registration #. Each
time a Registration # is entered it is to increase by 1 ..."

Exactly.

I understand your method of creating the *first* number, 8146614, but
subsequent numbers risk being lost using AutoNumber don't they?

Not unless a number is deleted. That can always happen. There is never a
100% guarantee that a record will not be deleted. Remember what I said. The
largest an autonumber can be is 2,147,483,647. that 10 digits. 8,146,614 is
a seed, there won't be any holes unless they are created, by adding a higher
seed sometime later.
--
Arvin Meyer, MCP, MVP
http://www.datastrat.com
http://www.mvps.org/access
http://www.accessmvp.com