select   h.bez as 'Hilfeart',
         sum(s.betrag) as 'Offene Auszahlungssumme'

from     hilfeart h, bustell s

where    s.hifanr = h.lnr

and      s.typ = 'Z'
and      (s.flag = ' ' or s.flag = '#')

group by h.bez

order by h.bez