If you must use full column efined names to test, try
=INDEX(ColB,ROW())>INDEX(ColA,ROW())
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HTH
Bob
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<(E-Mail Removed)> wrote in message
news:44fb1d93-579d-4811-944d-(E-Mail Removed)...
> I'm trying to use defined names in conditional formatting, whitout any
> luck. 
>
> Why doesn't it work if column A is named 'ColA' and column B is named
> 'ColB'
>
> I've entered a "formula is" under conditional formatting while colomn
> B was selected:
> = ColB > ColA
>
> A B
> 8 8
> 1 2 (here B should turn red)
> 5 4
>
>
> Any help is welcome. Thanks.