Hi Ankit,
With IDOC_AAE sender communication channel we can able establish technical connection from SAP R/3 system to SAP PI system using RFC.
If you are using default option, a single resource adapter is shared between all the sender channels of this option.
--> The PI system receiving the IDOC needs to query the sending R/3 system to understand the structure of the received IDOC. An RFC connection is created for this purpose on the PI system.
--> The same RFC connection can also be used by the PI system to post IDOC acknowledgement
messages to the R/3 system once the IDOC has been successfully processed or when errors are
encountered by PI.
--> The PI system registers a Program ID with a web application server gateway to receive RFC calls
from the R/3 system. The gateway chosen is typically that of the PI web application server but can
also be that of the R/3 system.
--> Finally a RFC destination is created in the R/3 system. This destination allows the IDOC layer in the R/3 to call the program ID that is registered on the RFC gateway either on the PI system or the R/3 system. The RFC destination in the R/3 system is referenced in the IDOC port configurations.