I am creating a site for a client that manages a motocross association. I would like to use the member admin to allow new riders to register. However, once a rider selects / enters a racing number, I need that number to be unique and not allow any future riders to register the same number.
Is there anyway to do this with out creating custom php scripts to handle this?
Or is there any 3rd party plugins that could handle this?
Any insight on this or suggestions on how to handle this a different way would be greatly appreciated
Thanks
Robby