Update mit Select über rowid

update unitrade.po
   set pos_RSVW = 'N'
where po.rowid in (select a.rowid
from unitrade.po a, unitrade.fa b
where a.POS_ART = b.fakt_art
and a.POS_NUM = b.fakt_nr
and b.fakt_art in ('BEL', 'BEO')
and b.fakt_status in ('F', 'R')
and b.fakt_liste = 'T');