{"id":1720,"date":"2026-02-10T15:54:35","date_gmt":"2026-02-10T13:54:35","guid":{"rendered":"https:\/\/www.sys-datgroup.com\/technisblu\/news-en\/sap-s-4hana-migration-everything-you-need-to-know-before-you-start\/"},"modified":"2026-05-15T14:03:19","modified_gmt":"2026-05-15T12:03:19","slug":"sap-s-4hana-migration-everything-you-need-to-know-before-you-start","status":"publish","type":"post","link":"https:\/\/www.sys-datgroup.com\/technisblu\/en\/blog-en\/sap-s-4hana-migration-everything-you-need-to-know-before-you-start\/","title":{"rendered":"SAP S\/4HANA migration: everything you need to know before you start"},"content":{"rendered":"\n

The date is there, and it is final: mainstream support for SAP ECC 6.0 ends Dec. 31, 2027. For thousands of Italian companies still operating on this platform, migration to SAP S\/4HANA is no longer a topic to be put off until the next strategy meeting. It is a concrete operational priority. Migrating, however, does not mean simply “upgrading software.” It means redesigning processes, cleaning up data, reorganizing the infrastructure, and managing change for the people who use that system every day. <\/p>\n\n

This article is a practical guide for business owners, CIOs, and IT managers who want to understand what a migration to SAP S\/4HANA really entails, what options exist, and how to get started on the right foot.<\/p>\n\n

Why migration to SAP S\/4HANA can no longer be postponed<\/h2>\n\n

December 31, 2027 is the deadline set by SAP for the end of mainstream support on SAP ECC. After that date, there will be no more security updates, patches or technical support on the ECC platform. Operating on a system that is no longer supported means exposing yourself to real risks: unpatched security vulnerabilities, regulatory compliance issues, and inability to integrate new tools or adapt to market changes.<\/p>\n\n

In addition, SAP S\/4HANA is not just an evolution of ECC. It is a system built on in-memory HANA databases, enabling real-time analytics, a simplified data structure (by merging BSEG and BKPF tables, for example), and a completely revamped user interface with SAP Fiori. The leap is not just technical: it is functional and organizational. <\/p>\n\n

The three migration options available<\/h2>\n\n

There is no single path to migrate to SAP S\/4HANA. The choice depends on the complexity of the current system, the degree of customization, historical data, and the company’s business objectives. <\/p>\n\n

Greenfield – new implementation<\/h3>\n\n

Greenfield migration involves implementing S\/4HANA from scratch, without bringing in any data or customizations from the existing ECC system. It is the most radical approach: it offers maximum flexibility to redesign processes according to standard SAP best practices, eliminate years of accumulated customizations, and start over with a clean system. It is the right choice for companies whose ECC is heavily customized or for those who want to seize migration as an opportunity for deep transformation. <\/p>\n\n

Brownfield – conversion of existing system<\/h3>\n\n

Brownfield is the technical conversion of the existing ECC system to S\/4HANA: historical data, customizations, and configurations are ported to the new system. It is the fastest and least disruptive approach, suitable for those who want to minimize risk and ensure business continuity. It is suitable for companies with relatively standard processes and well-governed ECC systems. <\/p>\n\n

Selective Data Transition<\/h3>\n\n

Selective Data Transition is a hybrid approach: you migrate to S\/4HANA starting with a new system, but selectively bringing in historical data and configurations you deem necessary. It combines the cleanliness of Greenfield with the continuity of Brownfield. It is often the most balanced choice for medium to large organizations. <\/p>\n\n

The main phases of a migration project<\/h2>\n\n

A well-conducted SAP S\/4HANA migration project follows a structured path. Typical phases are: <\/p>\n\n

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  1. Assessment and roadmap<\/strong>: analysis of current ECC system, identification of gaps, choice of approach, and definition of plan with time and cost<\/li>\n\n\n\n
  2. Data cleanliness and preparation<\/strong>: data quality is the most often underestimated critical factor; dirty data in ECC becomes an even bigger problem in S\/4HANA<\/li>\n\n\n\n
  3. Design and configuration<\/strong>: setup of the new system, design of processes, development of any necessary customizations<\/li>\n\n\n\n
  4. Testing and validation<\/strong>: UAT with key users, performance tests, regression tests, and cut-over simulations<\/li>\n\n\n\n
  5. Training<\/strong>: end-user training on the new system and redesigned processes<\/li>\n\n\n\n
  6. Go-live and hypercare<\/strong>: startup in production with intensive support in the first weeks<\/li>\n\n\n\n
  7. Stabilization<\/strong>: continuous monitoring and progressive optimization<\/li>\n<\/ol>\n\n

    The risks that should not be underestimated<\/h2>\n\n