That's not what it says in Unearthed Arcana. You still get the +2 bonus, even if you've gotten it before.
They give an example of a cleric5/fighter 2, with Fort 7(7.5), Ref 2(2 1/3), Will 5(5 1/6)
as opposed to the standard method which would be Fort 7, Ref 1, Will 4