ACE functionality continues to expand. In a move to facilitate more paperless entries, US Customs recently announced that filers may transmit anti-dumping/countervailing duty (AD/CVD) entry summaries via EIP/RLF in ACE. As the trade knows, this functionality is not available in ACS.
Now, these type 03 entries can be 100% paperless, although paper reimbursement certificates may be accepted (but not encouraged).
See CBP’s guidance for more details.