You define a trust relationship between your SAP system and the SAP Gateway host by configuring the SAP system to be the trusting system, and the SAP Gateway host to be the trusted system. By doing so, you enable remote logon for users who use the same user data in both the SAP Gateway host and the SAP system.
The following is an overview of the sequence for establishing trust in your system landscape:
In the SAP system: Configuring the SAP System as the Trusting System
Create an RFC destination for use in the trust configuration.
Define the system to be the trusting system, using transaction SMT1.
Configure the system to create and accept assertion tickets from the SAP Gateway host using the SSO2 wizard.
In the SAP Gateway host: Configuring the SAP Gateway Host as the Trusted System
Create an RFC destination for communicating with the trusting SAP system.
Configure the SAP Gateway host to create and accept assertion tickets from the SAP system, using the SSO2 wizard.