Oracle DB spinnt

[Union]

and mit or verwechselt und Klammer drum fehlt.

Code:

and (not exists ( select * from caseevent where caseevent.casekey=cases.casekey and caseevent.Eventkey=20241462)
  or not exists ( select * from caseevent where caseevent.casekey=cases.casekey and caseevent.Eventkey=20241534)
  or not exists ( select * from caseevent where caseevent.casekey=cases.casekey and caseevent.Eventkey=20241561))