ICR Config

Hello Experts,

I am very new to ICR process. I was trying to figure out where to start to learn the process because we would be using this ICR in Intercompany Billing (ECC and new implementation) and I have many unanswered questions regarding this.

a) The config that we do in T.code OBYA setting up GL accounts for intercompany postings has anything to do with the ICR process in ECC?

b) The configuration "Creating a trading partner (company) and assigning them to the company codes" has anything to do with the ICR process in ECC?

c) What is the basic configuration required for ICR process?

I would appreciate your help in regards to this.

Thanks & Regards,

Harish R