Logical system creation in BD54

hey guys
i have a very silly question,i m really confusing myself.
well i m doing a IDOC to File scenario.
on the R/3 side i have RFC dest(SM59) and Port(we21) in place,both pointing to the XI system.Port is SAPXD1(XD1 is system ID of the XI system).
i m confused in BD54 and WE20.
i go in BD54 to create a logical system with the name XD1CLNT100(XD1 is the system ID of the XI system and 100 is the client)
then i go in WE20 and create a partner profile,with the same name as Logical system(XD1CLNT100),then in the outbound side i enter the IDOC i m gonna send and give the Port name as SAPXD1.
lemme know if the above steps are right?
now my stupid question is,when we create a logical system in BD54,is that the logical system for R/3 or for XI?
is this the same logical system name which i have to use in SLD to create a business system for the sender service?
i have gone through lots of blog and links and m really confused.
please dont send any links.
appreciate ur help
thanx
ahmad

Ahmad,
Get in touch with the Basis Team. They should be able to give you the Logical System name of your R3 system . Normally it always is , SID"CLNT"ClientNumber.
You will only create on Business System and this will be the One for the R3 system using the R3's logcial system name.
When the Idoc is sent from R3, it will search in the SLD with its logical system name to find what the correspionding Bsuiness System is. After it finds the Business System it will fill the SOAP header with details like Sender Service and Sender Interface and Sender NameSpace and with these values deterkine the receiver.
As you are doing a file to Idoc, the receiver can be a thrid party business system or a business service.
The Receiever System is also a WebASABAP business system in case you are doing an Idoc to Idoc and that is a different case altogether
Regards
Bhavesh

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