Successful Greenfield Migration of 545,000 Objects to SAP S/4HANA at SBB Real Estate – Powered by COS-33

With one of the country’s largest real estate portfolios—ranging from train stations and retail spaces to residential properties—SBB Real Estate faced a major challenge: migrating over 545,000 objects from SAP R/3 and external systems to SAP S/4HANA. This ambitious project required strict standards for data accuracy, consistency, and performance. The key to success was the COS 33 solutions: CS 340 - S/4HANA migration cockpit RE-FX and CS 305 - RE-FX master data mass processing.

Initial situation

Over the years, the SAP R/3 environment had accumulated complex structures and redundant datasets. The transition to SAP S/4HANA was therefore not just a technical migration but a Greenfield consolidation of all real estate data into RE-FX.

The challenge: migrate 300,000 objects from SAP R/3 and integrate another 245,000 from external systems – while ensuring complete transparency, auditability, and minimal manual work.

Solution: COS-33 in action

At the heart of the Greenfield project, the CS 340 Cockpit played a decisive role. It enabled the structured, transparent, and audit-proof transfer of over 300,000 objects from SAP R/3 to S/4HANA.

Through integrated simulation, transformation, and logging features, every step of the migration was traceable and fully documented:

• Detailed mapping rules ensured accurate, real-time data transfer

• Successful conversion of areas, rental and deposit agreements, and partner roles

• Streamlined the cleanup of redundant organisational units

• Seamless integration of custom tables and fields

• A complete audit trail for maximum data security and transparency

With CS 305, approximately 245,000 objects from third-party systems were newly created in SAP RE-FX within a short time. Standardised templates and integrated upload functions ensured fast, consistent, and reliable data processing — key enablers for the Greenfield setup.

Result

The Greenfield migration to SAP S/4HANA has been a complete success, characterized by efficiency, transparency, and full audibility.

Today, SBB Real Estate operates with:

• A single source of truth in SAP RE-FX

• Streamlined, automated processes that guarantee quality

• A modern, flexible architecture built for future growth

Conclusion:

This project was far more than a migration — it was a strategic Greenfield transformation that turned a complex legacy environment into a solid foundation for innovation.

COS-33 was not just a technical enabler, but a strategic lever that made the Greenfield vision of SBB Real Estate a reality.

PS A special thank you to Sandro Baumeler, who successfully led the project as Lead Data Migration Real Estate.