ACE reconciliation has very different internal mechanics than ACS. Instead of using the entry data residing on your system (which as you know is rarely in step with CBP) we now retrieve all of the current values from CBP to base our changes on.
You should make sure you are familiar with the CBP publications on this subject which are available on https://www.cbp.gov/trade/ace/catair under supporting documents.
If you work through the menu options in order you will find that this should simplify the process.
- Build/Change Recon
- Auto Create Recon
- Statement Changes
Updated: Derek 03-07-18