if (!isSingleTableMapping(mappings[i], subclasses) && !isUpdate) return null;
if (!isSingleTableMapping(mappings[i], subclasses) && !isUpdate) return null;
if (!isSingleTableMapping(mappings[i], subclasses) && !isUpdate) return null;
if (!isSingleTableMapping(mappings[i], subclasses) && !isUpdate) return null;
if (!isSingleTableMapping(mappings[i], subclasses) && !isUpdate) return null;