How to deal with an Italian autofattura?

Summary:

Apparently an "autofattura" has to be created by an Italian buyer in case a non-Italian supplier invoices him. Normally we merely enter a Payables invoices towards the non-Italian supplier using offset tax. But in Italy one (or more?) document(s) is/are required in that case.

Content (required):

It seems like the Italian buyer has to create a Receivables transaction with himself as customer. The resulting Payables invoice (with the Italian buyer as supplier) would then also need to be entered. But what accounting should be used, because he cannot hit a revenue account for that Receivables transaction and how does he pay the actual supplier if the Payables invoice has himself as supplier?