BI Source system already exist

Hi

I already have an ECC system connected to my BI system in RSA1.

But now i want to connect one more ECC system to my BI system

When i go in RSA1 --> source system -->SAP-->give the RFC and user details and then try to create a connection it gives an error that source system already exist.

I checked with my BI resource and he conformed that we can have more than one ECC system connected to BI system

Can someone let me know how to do that

Thanks

Tushar