How many Communication Channels do we need?

Hi Friends,
  I am doing a simple IDOC-XI scenario. I have created two software components for the sender and receiver systems. Do i have to create a single communication channel or two?. Coz the Idoc from the sender system comes as an inbound into the XI Server(Communication Channel 1) and from here the idoc goes to the receiver system (Communication Channel 2). Correct me if iam wrong. In case we need to create a single communication channel(Adapter type XI, Radio button Sender is not enabled here?? ) what should be the RFC Destination?. Is it the sender system or the XI Stystem or the receiver system??.
Prompt replies would be rewarded.
Thanks in advance.
Regards,
Tamilarasan.

Hi Tamilarasan,
- you can only create IDOC receiver channels
- if you have two R3 systems you have to create
two communication channels (one if the receiveer is the first R3 and the second one if the receiver will be the second R3)
so if you have:
a) firstR3 -> XI -> secondR3 scenario
you have to create only one communication channel for idocs
if you have:
firstR3 -> XI -> secondR3
firstR3 <- XI <- secondR3
then you'll need two channnels:)
IDOC configuration reference:
IDOC adapter
http://help.sap.com/saphelp_nw04/helpdata/en/ab/bdb13b00ae793be10000000a11402f/content.htm
IDoc Processing with the IDoc Adapter
http://help.sap.com/saphelp_nw04/helpdata/en/ab/bdb13b00ae793be10000000a11402f/frameset.htm
Regards,
Michal

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