If you want to get items that don't match a series of like conditions, I would suggest regular expressions. Perhaps what you want is:
SELECT item, short, itemgr
FROM DATABASE.ITEM i
WHERE i.marker = 0 and
i.itemgr in ('200', '201', '202', '204', '205', '230', '234', '236', '240', '270', '285') and
not regexp_like(short, 'AQUA|TERRA')
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