Here is the statement with full qualified name:
select ma.ma_idx, ma.ma_kurztext_deu, kd.kd_preis, kl.kd_preis
from debitor db, material ma, kondition kd, kondition kl
where db.db_idx = 9009000 and db.db_ko_vkpreis = kd.kd_pl_idx and
db.db_vkorg = kd.kd_vkorg...