What's the best way to enforce field uniqueness when the field is allowed
to be null? This should work whether data is being entered manually or by
FileMan APIs (internal value which means input transform isn't
useable). I'm looking for the behavior of a key index but that allows for
null entries. The field is not a .01 field.
I also need to be able to screen the entry for the field and only accept
those that are in a "pick list".
I was thinking about using an xref but I wasn't sure when/if I could safely
delete the field's value from within an xref fire (if the field value is
not unique or not in the pick list then it needs to be deleted).
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