'V0' + case isnull(len(ltrim(codilpro)) ,0)
     when 0 then '0'
     when convert(int, convert(varchar(3), ltrim(codilpro)) >= 21 and convert(int, convert(varchar(3), ltrim(codilpro))  <= 80
                then '0'+ltrim(codilpro) 
     else ltrim(codilpro) 
end