Diagnosis
In the system list, a system was highlighted as the development systemfor the structure of the System Administration Assistant. It is the notthe current system.

System Response
You can only maintain the structure in a development system.
For consistency reasons it must be the same system in which the systemlandscape is configured for the System Administration Assistant.

Procedure
Decide in which system you want to maintain the structure of the SystemAdministration Assistant and configure the system landscape for theSystem Administration Assistant.
Log on to the relevant system and go to the maintenance dialog of theSystem Administration Assistant. Configure the system landscape firstand then change the structure, if necessary. Changing the structure isnecessary if your administration tasks are different from the SAPtasks.
Ideally, the development system is the current system for the SystemAdministration Assistant.