Hi Andrei - Then PI system is good.
Can you confirm one thing - Did you try running the interface end-end?
Incase you are worried about the The reason why your XI channel is not showing in CC monitoring then it is because "XI" and "HTTP" adapters resides on the Integration engine and hence you can not monitor them in AE.
I think i over looked you reply as i thought it is in PI system.. i just read it again..
"Tcode SLG1 shows in time of CacheRefresh in ERP.
What is "http_body_size = 0" error? I can't find out in SAPNotes"
I'm not sure if you can use it in ECC system as it is for XI directory cache.