This upgradestep would break the special behaviors, which are configured for individual cutstomers, see [opengever.phvs](https://github.com/4teamwork/opengever.phvs/blob/master/opengever/phvs/profiles/default/types/opengever.dossier.businesscasedossier.xml#L7) for example.

Could you rework the upgradestep, so that it only drops the no longer needed behavior?