In Natural Security a utility profile must be set up to explicitly allow the SYSOBJH NATLOAD function.
Go to the Natural Security Admin Function screen and switch to the Admin2 screen (PF8).
Select the Utility Default/Template option.
Add the utility SYSOBJH
It will be created with everything disallowed, you must explicitly allow the different functions for the different Natural types.
Refer to the appropriate Natural Security manual for your Natural environment for more information.