Stored Procedure con un If después de un Select

[[ArdiIIa]]

Código SQL [-]
 else begin
        FOR Select BOJ2.BOOKINGNO 
        from BOOKINGS_OBJECTS BOJ2
        left join BOOKINGS BO2
          on BO2.BOOKINGNO = BOJ2.BOOKINGNO
        where
          BOJ2.BUILDINGNO = :"BUILDING_NO" and
          BOJ2.OBJECTNO = :"OBJECT_NO" and
          BOJ2.DATEFROM >= :"DATE_SP" and
          BOJ2.DATETO <= :"DATE_SP" and
          BO2.STATUS <= 2
          Into BOOK_NO
        do suspend;
      end

Si la primera falla, devuelveme lo segundo....