You need to look into below from a High level point of view -
1) Migrating CS to ICO/iFlow. (You can use Directory content migration tool)
2) Convert HTTP adapter to HTTP_AAE, IDOC to IDOC_AAE, XI to SOAP with transport protocol HTTP and message protocol XI 3.0.
3) Changing ABAP mapping to JAVA Mapping.
4) ccBPM to NWDSBPM.
5) New connection and setting for IDOC and proxy communications.
6) Classic Alert configurations are required to convert to CBMA.
7) Migrating ESR contents and SLD content to the new server as a tpz file.
8) Setting up CTS+ connecting with back end SOLMAN for transport management.
Hello Raghav,
As a starting point, I would recommend this excellent blog Upgrading SAP XI or SAP PI to SAP PO by Mario De Felipe.
Best regards
Frank
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