My guess is that CashFlower/CashFlower/AusgabenView.h has already been deleted in SVN repo (from someone else) and you are trying to commit deletion again. You can check that listing dir: svn ls . If so, then try svn cleanup, and then svn update.
Is is possible to commit a older revision such that it becomes the new latest reversion?
Yes, this is called reverting to an older revision (actually, what is described is not the only way to do this).