Since goods are usually entered for consumption at the border of the United States customs territory, the "customs declaration before goods receipt" integration scenario is best suited for cross-system import processing in the SAP ECC or SAP S/4HANA feeder system and SAP GTS.
Upon arrival of the goods at the border or once the advanced shipping notification has been received, you can create a customs declaration from the work list using the Enter Customs Decls Before GR app. Based on this document, you can submit the entry or entry summary via ACE and receive CBP’s response messages.
If you file formal entries, you have to map the customs bonds deposited with CBP as master data in SAP GTS. You create these master data in the SAP Fiori launchpad using the Manage Import Securities app in the Customs Import space on the Master Data page.