yes sorry, my mistake. if you don't mind you can try this

select a.PersonID, a.Version, a.DEDate,

case when b.PersonID is null then 0 else 1 end AS [Is ImProper]

from PersonRecord a

left join (

select distinct a.PersonID

from PersonRecord a

inner join PersonRecord b on a.PersonID = b.PersonID and a.Version>b.Version and a.DEDate<b.DEDate

) b on a.PersonID = b.PersonID

thanks