SAP BW RSA1 Error

I had come across a situation where the Client had setup RSA1 Transaction in Client 001 in a NetWeaver 7.3 BW System.
The Client had later Created a New Client XXX and changed the entry in table RSADMINA to point the BW Client to XXX.

But when accessing transaction RSA1 in Client XXX , the below error was being poped.

PROBLEM Resolution

When Client had accessed RSA1 in client 001, a source system (Self BW System) <SID>CLNT001 was created in RSA1.
After this , the client was trying to reconfigure RSA1 on another Client.

Resolution

 1) Go to Transaction SE16 – table RSBASIDOC to determine all existing source system connections

 2)  If entries exist:
 Note down all these entries: fields RLOGSYS and SLOGSYS.

Go to Transaction SE37 – function module RSAP_BIW_DISCONNECT –
Single Test.
Pass the  Parameter
I_BIW_LOGSYS = <RLOGSYS>,
 I_OLTP_LOGSYS = <SLOGSYS>,
I_FORCE_DELETE = ‘X’.
DO NOT enter a value in the “RFC target sys” field. If you do, this causes the function module to run in the system specified there.
This step deletes the BW Connection <SID>CLNT001.

After this RSA1 was executed in SAP Client XXX , and the issue was resolved.