In OOTB hybris smartedit throws FlexibleSearch errors on personalization view and most part of customization functionality doesn’t work. Exception will inform that there is an error in SQL syntax near UNION ALL.
OOTB hybris has a powerful “Flexible Search Restriction” system, which allows transparently restrict access to any hybris item type. Due to flexible search restrictions are implemented on a very low level of hybris ORM time to time unexpected issues can appear even for simple restrictions.