Corrigir erro UNIQUE na CFEID da POV_cadPOV

UPDATE POV_cadPOV SET CFeId = NULL

            WHERE IdPOV IN (

                            SELECT

                            origem.IdPOV

                            FROM POV_cadPOV origem
                            WHERE origem.CFeId IN (SELECT cfeid FROM pov_cadpov GROUP BY cfeid HAVING COUNT(CFEid) > 1)
                            AND

                            origem.IdPOV <>

                            (SELECT TOP 1 IdPOV FROM POV_cadPOV temp WHERE temp.CFeId = origem.CFeId ORDER BY DATA ASC)

                            ) -- fecha in