Beginning July 23, 2016 trade parties will be required to submit electronic entries and entry summaries for additional entry types to Automated Commercial Environment (ACE).  Electronic entries and entry summaries associated with the following entry types will be accepted and mandated in ACE: 02, 07, 12, 21, 22, 31, 32, 34, and 38.  Filing of electronic entries and entry summaries associated with entry types 06 and 23 were previously mandated in ACE if they did not include quota merchandise.  Filing of these transactions with quota merchandise will also be mandated on July 23, 2016.

This has been excerpted from 23 June 2016 notice by U.S. Customs and Border Protection and is available in its entirety at:
https://www.cbp.gov/trade/ace/features/quota-ace