Perfect. Clearly the trick here is just getting used to all the options 
available. I have yet to find something I can't do but, much like learning 
any new language (computer or natural) you just need to get used to it. 
Thanks.

On Monday, December 16, 2013 3:17:58 PM UTC-6, Anthony wrote:
>
> I guess you could make it a plain integer field and use 
>> requires=IS_EMPTY_OR(IS_IN_DB(db, ...))
>>
>
> I think that's the way to go, but you don't have to make it a plain 
> integer field -- can still be a reference field.
>
> Anthony
>

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