Error al actualizar Unirse

use actualizar para seleccionar por unirse

 UPDATE (select NON_CONFORM_ALLOCTABLE
         from FGMULTI 
          JOIN arinvt ar 
          ON  fgmulti.arinvt_id = ar.id 
         WHERE IN_Date = CurrentDate 
         AND ar.Class LIKE 'CP%' 
         OR ar.Class LIKE 'FG%' 
         OR ar.Class LIKE 'IN%' 
         OR ar.Class LIKE 'LA%' 
         OR ar.Class LIKE 'PK%') t
 SET t.NON_CONFORM_ALLOCATABLE = 'Y'