SAP Message 6G108 - Define structure nodes first and then keywords

Diagnosis
You want to define and assign new key words.
The system determined that in the current system no originalstructure nodes have been created for the System AdministrationAssistant.

System Response
Structure nodes original to this system must exist before you candefine key words.
You cannot maintain key words in systems that do not have originalstructure nodes.

Procedure
If you want to insert your own entries in the System AdministrationAssistant, you must first create them. Then you can define keywords andassign the structure nodes.
If you do not want to add any entries in the System AdministrationAssistant, and only want to make modifications to existing structurenodes, you must use the existing keywords.