Intercompany Billing without MM module

Hello Guys,

I'm implementing ECC6 and we would like to have a simple Intercompany Flow in which: for each SD invoice made in company A to customer "company B", account payable FI postings are automatically triggered in company B for vendor "company A". We do not have MM, so we need direct FI postings to AP.

Have you ever seen it working ? Do you guys have any documentation on this subject or any customizing guidelines ? I get the basic idea (idocs, etc) but need more guidance. Thank you !