SAP ECC with HANA represents a scalable enterprise resource planning architecture integrating Presentation, Integration, ERP Core, and Database layers. End users access SAP Fiori via web browsers and mobile clients through a WAF/Firewall and API Gateway, while satellite systems like Salesforce CPQ, SolidWorks PDM, BlackLine, and SAP Ariba connect via SAP IS Suite, CPI, and ESB middleware. The ERP Core modules—FI, CO, MM, SD, EWM, SCM, GTS, PS, CS, and MDM—process transactions and persist data to SAP HANA DB Primary with Secondary HA and DR Site replication for high availability. This architecture demonstrates enterprise-grade integration patterns, multi-tier security, and disaster recovery best practices essential for mission-critical financial and supply chain operations. Fork this diagram on Diagrams.so to customize module connections, add additional satellite systems, or adapt the integration layer for your specific landscape. Consider adding SAP Cloud Platform or extending to hybrid cloud deployments for future scalability.