Massimiliano, that's a great, targeted question. 

I would suggest 2 sources of knowledge:

1. Conversations. Aim to connect via LinkedIn with people who work in the ERP space and who could share how such organisations work. Try to find people who are similar in seniority to you and with whom you have something in common to prompt the connection (e.g., went to the same university)

2. Reading. Go on the websites of the big ERP companies. Read about how they work. Go through some of their published works. Then do the same with McKinsey's website to read their publications on ERP. This will give you a sense of the trends. 

I served as a McK consultant on a long-term global transformation for one of the world's largest ERP providers, so happy to also provide a perspective if you'd like to.

Best,
Cristian