I'm trying to write code which rolls back the older Version of Content. It is executed but it doesn't have any effect. Does anybody know why?

        Enumerable<IContent> versions = Services.ContentService.GetVersions(id).Where(n => n.CreateDate < new DateTime(2016, 11, 01));
        IContent version = versions.OrderBy(m => m.CreateDate).First();


        IContent erg = Services.ContentService.Rollback(id, version.Version);

        Services.ContentService.SaveAndPublishWithStatus(erg);