Vidhi,
>>>1. Confusion on SAPRelease value - I am on ECC 6.0 version with respect to sender ECC system (IDOC Sending system). I am using SAPRelease = 6.0 or if it is going to be receiving system SAP Release - PI 7.31.
It is fine & your understanding is right ( Sending system ECC , that is IDOC tiggering system)
>>>2. Second confusion is - What should be the port number? When we go an edit this value, it says it should be the system ID of ECC system.
Tcode - we19
Cheers
Agasthuri