Trusted System Set-Up

Ensure an RFC connection from the remote system to the trusted system (and vice versa) exists
Ensure the RFC connection does not have 'Trusted System' option ticket

Run transaction SMT1 in remote system
Click Create
Enter the name of the RFC connection to the central system
Enter log in details
Save new entry

Run SMT1 in the central system to create connection to the remote system and repeat steps above

Run SM59
Change RFC connection so that the 'Trusted System' option is selected

Set SMSY to use data from SLD

Run transaction SMSY_SETUP