Hi, guys: hard to understand XI IDoc to file,

I have work through this scenario. My colleague have problem to understand it. I think it is a little hard to explain it.
About logical system, We can say ERP send IDoc to XI , and XI convert it to file. and then the logical system name should be XI client's. But in XI, we always define business system or business service for other systems not XI itself. And service FTP2 must have a logical system for IDoc related scenarios , others(RFC,JDBC, file and etc) don't need.
When we define logical system and partner profile for file system, we use RFC destination from ERP to XI.
For ERP A to ERP B, it is easy to understand, we should define logical system for B system in A , which is identical in B.
logical system, partner profile in SAP ERP, and business service/ business system in XI are both to represent a (logical)business system.
-- if ftp2 use logical system of XI, then another system can't use it. and maybe it can't work, business system can't use XI's logical system.
Any ideas? Am I right?

HI Shen,
You are try to understand this bit complicated concept is on right track.
Let me explain this step wise.
1. About logical system, We can say ERP send IDoc to XI , and XI convert it to file. and then the logical system name should be XI client's. But in XI, we always define business system or business service for other systems not XI itself. And service FTP2 must have a logical system for IDoc related scenarios , others(RFC,JDBC, file and etc) don't need.
---->
Here XI is just middelware so While sending the IDOC from R/3 to XI you need the Logical system with Receiver Port as directing to XI client. The Receiver Logical system is not imp. incase of sender IDOC.
But when you will be sending the IDOC from XI to R/3 then the Logical system should be maintained, because the inbound IDOC processing program will work as per the details of Contorl IDOC and the Logical system that will point from XI. This will not be the case for other RFC, JDBC, file etc, as they don't have any kind of Control -Records to be maintained.
2. if ftp2 use logical system of XI, then another system can't use it. and maybe it can't work, business system can't use XI's logical system
---->
Yes, Once you have used the Logical system name in any of the Business service or Business system then you can't re-use it. This makes possible the feature of Re-usability. You can create the multiple communication channels under this Business service/system
Hope this will be clear now
Thanks
swarup
Edited by: Swarup Sawant on Jun 25, 2008 10:24 AM

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