How to change the source system

Dear Experts,
I have Ecc1 as one of my source systems to BW Quality.Now the client wants to stop the present source system and wants to get the data from new source system i.e. Ecc2. To divert the present flow to new flow.I have looked the previous post regarding the same but are not clear to me. could some one let me understand steps to look into.
Thanks Regards,
Mannu

you need to maintain RFC to the new source system
delete old source system
create source system connection from RSA1
Run BDLS to point the data sources to new source system. This should be run on both BW and ECC.
See the below post
https://forums.sdn.sap.com/click.jspa?searchID=1255799&messageID=2880041
Re: R/3 to BW Connectivity
Re: RFC Connections

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