We can straight away edit the table DBCON and create the entry of the new connection but here i will try to show it with the DBACOCKPIT Tcode:-
Fill the required entries.
Test the connection but it will show the error as we have to make the entries in tnsnames.ora:-
Create an entry for the new DB connection as below:-
After making the entry again try the test connection. It should work fine.
Then Create an entry In BD54:-
Now go to RSA1:-
Add the Source system name:
Make the entries and Click save.
Thus the system is added as source system:-