Many companies still use the tried-and-tested SAP HCM system.

This runs on old technology (ECC) and needs to be migrated to SAP HCM for S/4HANA (H4S4) before support expires.

Yes, 2030 still sounds a long way off – but for SAP projects, it’s practically the day after tomorrow. Anyone who has ever been involved in a major payroll conversion, system migration, or new HR strategy knows that these things don’t just happen overnight. Processes take time. Systems even more so. And people, of course.

This is exactly where many HR teams currently find themselves:

Day-to-day business runs smoothly on SAP ERP HCM. Payroll accounting should and must continue to function flawlessly, but at the same time, there is growing pressure to move strategically toward SAP S/4HANA and cloud solutions such as SAP SuccessFactors.

And then there it is – the crucial question: How can we further develop our HR system without turning everything upside down? What works for us?

Die Realität in HR-Abteilungen mit SAP HCM

More and more often, the impression arises that you have to choose between on-premise with SAP HCM for SAP S/4HANA (H4S4) or cloud with SAP SuccessFactors. Both have their merits. But not every company can or wants to move completely to the cloud right away.

Typical reasons for this include:

• Sensitive HR and payroll data with high compliance requirements
• Complex billing schemes (e.g., collective agreements, shift models)
• Dependencies on third-party systems or in-house developments
• Interfaces to time management, travel expenses, or pension administration

Why the Big Bang theory rarely holds true

On paper, a complete system change seems elegant and clean—in practice, however, it is usually risky:

• Significant administrative effort
• Change management under maximum pressure
• Risk to highly critical processes such as payroll and time management

These core processes leave no room for experimentation. Mistakes here destroy trust – both internally and externally.
Payroll and time management leave no room for error. Incorrect or late payrolls, missing allowances, or faulty time entries quickly erode employee trust and raise doubts about the reliability of HR and IT.

At the same time, both areas are subject to special scrutiny. Management, the works council, and external auditors expect stable, compliant processes. Even minor deviations can trigger audits or inquiries by authorities and social security agencies.

The solution:
Hybrid does not mean half-hearted—it means strategic.

A hybrid SAP HCM landscape deliberately combines two worlds—according to our recommendation—for example, as follows:

• Core processes such as payroll and time management continue to run on SAP HCM for SAP S/4HANA (H4S4) – operated on-premise, in a private or public cloud.
• More innovative HR areas such as recruiting, learning, and talent management are mapped in the cloud with SAP SuccessFactors. ​​

In this case, a hybrid system solution is not a compromise, but a well-thought-out strategy, because it allows operations to continue running smoothly—and innovation is still possible.

So funktioniert es:
Das Core-Hybrid-Modell in der Praxis

In the core hybrid model, SAP SuccessFactors Employee Central (EC) takes on the role of the leading master data system, from which data is replicated to the on-premise HCM via predefined integration scenarios, either point-to-point or via the SAP Integration Suite.

The clear benefits:

• A uniform, centralized HR master data base
• Stable payroll and time management based on proven SAP technology
• Modern user interfaces and automated HR processes in the cloud
• Reduced integration effort thanks to preconfigured best practices

Practical example:
An industrial company relies on SuccessFactors Recruiting and Learning, but keeps payroll and time management on H4S4. This allows the HR team to use new cloud services without jeopardizing legally critical accounting.

 

That’s why SuccessFactors is indispensable – modern HR processes without downtime

SAP SuccessFactors (SF) is much more than just a new interface. When implemented correctly, it significantly improves the daily work of HR employees:

• Self-services relieve the burden on HR and specialist departments
• Recruiting workflows become more transparent and faster
• Regular updates bring continuous innovation

Hybrid therefore does not mean stagnation, but rather the opposite—targeted prioritization and more time to consider “What adds value to my department/company today—and what can follow later?”

H4S4: A measured migration, not reckless moves

Although the move to H4S4 might at first glance seem like a purely technical upgrade, it is far from just a “standard option” within S/4HANA. It requires an active migration – including the HANA database, code adjustments, and Fiori rollout. Since H4S4 forms the foundation of HR IT, this affects not just individual components but also data, processes, interfaces, and responsibilities.

Sensitive personal data must:

• be migrated securely and completely,
• remain available during ongoing operations,
• fit strategically into the future HR architecture.

A successful H4S4 transformation should therefore ideally not start directly with technology, but with considerations regarding scope, target architecture, and priorities. Similar to building a house, an H4S4 project also begins with the question: “What should the house actually contain?” Only then can you decide which walls will remain and which will be rebuilt.

Concise and clear from consulting practice

HCM SSC CEO Roland Quade shares practical tips on hybrid SAP HCM scenarios, H4S4 projects, and HR IT collaboration. 👉 Watch the short videos now.

Start your hybrid SAP HCM landscape now: secure the stability of your payroll and time management today while creating agility for tomorrow. We guide you step by step, keeping a clear focus on systems, processes, and people.