Problem with data validation formula *** structured reference *** XL2007




I posted this on another group, but I don't seem to get a satisfactory

In an excel 2007 table (yes, a table), I want that one column has
unique values. I
want to check this at input time, with a data validation function.

Say that I have Table1

a b
qw 1
as 2
zx 3
fg 4

where a and b are column names (headers). I don't want another "qw" or
value in column a.

I have tried with Data/Data Validation, with a formula like


but the countif function does not seem to recognaize structured
references in data validation formulas.

How could I get around this problem?

Thank you


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