From a technical perspective, SAP GTS is an ABAP add-on product with the software component name SLL-LEG. The current version of this software component is V8000 (SAP Global Trade Services, edition for SAP HANA). SAP GTS can be installed as an independent instance on SAP S/4HANA Foundation 2020. It is based on the SAP HANA database.
In addition to the software component SLL-LEG, the software component UIGRCGTS (SAP Fiori for SAP GTS, edition for SAP HANA) is required for the deployment of SAP GTS.
The software component SLL-LEG comprises all functions for international trade. To set up an integration scenario, an SAP ECC feeder system requires the software component SLL_PI, a plug-in that enables the exchange of data with SAP GTS. No plug-in is required in SAP S/4HANA feeder systems because all technical objects required for communication with SAP GTS are contained in the software component S4CORE. For more information about setting up a system landscape with SAP GTS, see the Administration Guide and the Integration Guide published in the SAP Help Portal.
The data exchange between the feeder system and the SAP GTS system is based on Remote Function Calls (RFC), an SAP-specific technology for communication between SAP systems, but also between SAP and non-SAP systems. The required settings are described in detail in the Configuration Guide that you can find in the SAP Help Portal. After completion of these technical preparations, which are usually the responsibility of system administration, you can set up process integration.