Hi Puja,
It needs to be changed (check your scenario, is it embedded or central hub. Please carefully read SAP Fiori LL18 - System Aliases definition for Fiori). In my case (central hub), I want to connect to client 100 of backend system SOH. The configuration is shown as follow.
The trusted RFC to the backend system should be created already.
For detailed information about this, please check Explore SAP Fiori apps rapid-deployment solution (RDS)
Download RDS
Check document EE0_NWG20_BB_ConfigGuide_EN_XX which tells you how to configure your Fiori launchpad foundation.
Regards,
Ning