ACER has issued an updated Frequently Asked Questions document on transaction reporting, which can be found here. The new answers span several topics, mainly looking at how to report very specific scenarios, based on questions received. There are a few questions on backloading and scope of reporting as well.
ACER has also issued the second version of the list of valid Energy Identifier Codes (EIC) that can be reported as the destination of a trade. This is found in the relatively new 6th Annex to the Trade Reporting User Manual (TRUM) and can be found here.