Electronic debit verification: manual endorsements on physical Advance Authorizations discontinued; officers must ensure EDI debits and issue advice letters. The practice of manually endorsing physical Advance Authorizations with usage debits is discontinued for future authorizations electronically registered at Customs EDI locations; examining officers must confirm the proper debit in the EDI system. For domestic sourcing ARO/Invalidation requests, holders must obtain a same-day Advice Letter from the Group DC/AC, who will update records and email the Advice to the Regional Authority; monitoring and coordination arrangements are designated and safeguards for EDI breakdowns are required.