Determine status based on date

this should do it:

create table #s(pn int, es char(2), dt datetime)

insert into #s
select 12233  ,      'ES'    ,       '09/01/2009' union all
select 12334   ,     'ES'   ,        '03/02/2009' union all
select 12331    ,    'SA'  ,        '01/06/2009'   union all
select 12233     ,   'SA' ,         '01/03/2009' union all
select 12233      ,  'PA',          '02/01/2009'

The codes are:

ES - Obsolete
SA- Active1
PA - Active2

What I would like is a function that looks at the uniqe PN and gives me the current status based on today's date.  
For example, 12233 should give me a status of PA since it hasn't reached a status of ES yet.
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select *
from #s s
where dt = (select max(dt) from #s t where s.pn = t.pn and dt < getdate())

How will this work with the following table and fields, I can't seem to get it to work.

SELECT     [Material Number], [Global Event Code] AS [Global Event], [Planned Date]
FROM         dbo.LCGBEV