Oracle view to get a field value based on another row

I have an oracle table for Documents with fileds DocNo , Revision, State , Plant
  Only some revisions  for a given docno has the plant value  
   sample data
   DocNo  Revision  State Plant
    Doc1       1            1      
    Doc1       2            1         P1
     Doc1      3             2    
    Doc2       1            1        
     Doc2       2            3        P2

  I need a view with following
   For rows where Plant value present  return state as state * 10
   For rows with no plant value , look DocNo and return plant value   from the row  for same DocNo with plant value

  View should be like
DocNo  Revision  State Plant
    Doc1       1            1           P1
    Doc1       2            10         P1
     Doc1      3             2         P1
    Doc2       1            1          P2      
     Doc2       2            30        P2
Sam OZAsked:
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slightwv (䄆 Netminder) Commented:
Try this:
select docno, revision, case when plant is not null then state*10 else state end,
	first_value(plant) over(partition by docno order by docno) plant
from tab1

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