Sorted.
For anyone interested:
I was working in the wrong embed point
      ! Start of "Option Filter & Order"
      ! [Priority 5000]
      IF p_web.getSessionLevel() <= 4 !Dealers
          WOR:OrderStatusID_OptionView{prop:filter} = p_web.CleanFilter(WOR:OrderStatusID_OptionView,'WOS:DisplayOrder <= 2')  
      END
      
      ! End of "Option Filter & Order"
      
Works perfectly