The Exchange System distinguishes between three types of file:
For the FatturaPA file signature, see the Sign the FatturaPA section.
The system processes the archive, checking the individual FatturaPA files contained within it and forwarding it to the addressee. In practice the FatturaPA files are treated as if they were transmitted individually.
The archive file must not be signed but, instead, all the FatturaPA files in it must be signed.
A message file can be:
To view some examples of message files go to the Exchange System documentation section
The Exchange System gives a different name to each message file type. For more information on naming message files see Annex B-1 of the document Technical specifications of the Exchange System - draft - pdf in the Exchange System documentation section.
All messages produced and sent by the Exchange System, with the exception of the metadata file, are signed electronically with an advanced, XAdES-Bes electronic signature.
The client outcome notice, the only notice sent by the addressee to the ES, may optionally be signed electronically, again in XAdES-Bes mode. For more information on the client outcome notice see the Communicating the outcome for the FatturaPA section.
There is a simplified flow which can be adopted by those who interact with the Exchange System in their roles as both transmitter and receiver through the same transmission channel; in this case the flow of messages undergoes changes to enable greater efficiency in the process of transmitting electronic invoices and the related notices.
More specifically:
are not delivered because they are already available to the transmitter.
The process continues with the normal flow stages as if the files had been correctly transmitted.
The “Simplified Flow” option is associated with the registered channel for file transmission/reception; therefore Intermediaries intending to opt for the simplified flow may declare this when they register the channel in the Register the channel section.
NB: the “Simplified Flow” option is available for the Web-service, Domain Gateway and FTP transmission channels but not for the CEM and web transmission channels because these do not need prior registration with the Exchange System.