In the activity, Define Project Landscape you specify the systems you want to use in your project. To add a system, you specify an RFC destination to that system.
An RFC destination to the system you want to add exists.
The RFC user must have either the CDMC master role SAP_CDMC_MASTER or the CDMC user role SAP_CDMC_USER.
The system you want to add has a minimum support package level of ST-PI 2008_1_* SP04.
Execute the activity Define Project Landscape
Choose the Select Systems from Standard RFC Destinations radio button
Specify a suitable RFC destination