Not sure if this is what you are trying to do but how about:

SELECT

pr1.PersonID,pr1.Version,pr1.DEDate,

CASE

WHEN (pr1.DEDate < pr2.DEDate)

THEN 1

ELSE

0

END AS Improper

FROM

PersonRecord pr1

LEFT JOIN PersonRecord pr2

ON

pr1.PersonID = pr2.PersonID

AND

pr1.Version = pr2.Version + 1