There are plenty of things one cannot do as sysadmin in Oracle eBusiness Suite's Asset Management.

The tabs seen here are going to show up for "regular" users and not the administrative superuser (sysadmin) as best as I can tell. There is likely a way to unlock this sort of functionality for sysadmin, but creating and updating records is not typically seen as of its pervue and thus those sort of capabilities are walled off from it.