The Guide to SAP S/4HANA Transformation

What is SAP S/4HANA Transformation?

An SAP S/4HANA transformation is the strategic migration of an organization’s legacy enterprise resource planning (ERP) system to SAP’s next-generation, in-memory S/4HANA platform. This transformation process involves auditing legacy custom code, migrating business data to the cloud, and adopting the SAP Fiori interface to accelerate performance and enable advanced analytics.

Organizations must upgrade to SAP S/4HANA before the 2027/2030 maintenance deadlines to avoid the risk of business-critical operations running on outdated and unpatched software. Moving enterprise architecture to the cloud is a complex process, which is why understanding the core methodologies and risks is critical.

The 3 Approaches to S/4HANA Transformation

When migrating to SAP S/4HANA, organizations must choose how to handle their legacy data and custom code. Based on enterprise architecture best practices, there are three primary implementation paths:

1. Greenfield (New Implementation): Starting from a blank piece of paper. Organizations leave behind outdated legacy code, old data, and abandoned processes to build a fresh, optimized system. It is the required approach for public cloud-based SAP implementations.

2. Brownfield (System Conversion): A mix between new and old, converting the existing SAP ECC system and bringing legacy code and data into the new SAP S/4HANA environment.

3. Bluefield / Hybrid (Selective Data Transition): Brings over business process configurations into SAP S/4HANA, but only selective data. It relies on a tool-driven process to consolidate databases and clean up the footprint.

Benefits of Digital Transformation with SAP S/4HANA

SAP S/4HANA automates business processes and establishes the foundational architecture required to utilize intelligent technologies such as artificial intelligence, machine learning, and the Internet of Things (IoT).

The platform provides advanced data management and analytics capabilities while supporting agile application development and secure integration.

The Reality of S/4HANA Transformation Risk

As CIOs evaluate their transformation roadmaps, one metric stands out: failure rates. Attempting to lift-and-shift complex ERP systems without a secure methodology leads to severe cost overruns and operational downtime.

The percentage of digital transformation projects that fail to deliver positive results.
The percentage of digital transformation initiatives that crash and burn completely, wasting enterprise budgets.
The average cost of a failed, delayed, or scaled back digital transformation project

Navigating an SAP S/4HANA or SAP RISE digital transformation journey typically involves the following core challenges:

Over decades, organizations generate millions of lines of custom ABAP code. A major step in the transition is determining which custom objects are obsolete and which contain critical vulnerabilities. Moving unreviewed code into S/4HANA introduces massive compliance and security risks.

Accelerated modernization creates intense pressure to avoid project delays. Treating security as an afterthought causes massive roadblocks during the testing phase. However, integrating security early acts as an accelerator.

For example, a global advertising company (54K+ employees; >$9B revenue) processing $6.0 billion annually in SAP integrated The Onapsis Platform to secure their SAP HANA migration. By stabilizing applications during the “build” phase rather than waiting for post-migration patching, they finished the entire migration a full year ahead of schedule.

Moving to the cloud via SAP RISE shifts the infrastructure burden to SAP, but customers remain fully responsible for the application layer. Operations teams must be prepared to secure user access, custom code, and data governance under this new shared responsibility matrix.

Organizations lacking internal S/4HANA expertise rely heavily on system integrators (SIs). Validating the quality and security of the code delivered by external SIs using manual peer reviews is a slow, error-prone process that threatens business continuity.

SAP transformations frequently bring ERP environments under the purview of the Chief Information Security Officer (CISO) for the first time. Standard enterprise security tools cannot parse SAP-specific protocols, requiring specialized SAP DevSecOps integration.

Get ahead of the blockers by starting with security in mind and anticipating risk for every step of the way during your SAP S/4HANA or SAP RISE transformation.

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A DevSecOps Methodology for Each Stage of Transformation

The Following Stats Reflect Key Issues Encountered During the Planning Stage of SAP RISE Projects

of organizations consider existing customizations as problematic to their path to S/4

of organizations expect to face security challenges during their transformation

Before writing a single line of new code or moving a transport, you must establish a security baseline. During the “Plan” phase of DevSecOps, architects evaluate the health of the current operating model:

  • Assess the Baseline: Identify legacy system vulnerabilities and custom code issues prior to a Brownfield or Bluefield migration. If going Greenfield, assess standard SAP configurations against best practices.
  • Clean the Core:Decide which legacy custom objects will be abandoned in favor of standard S/4HANA functionalities.
  • Set SI Requirements: Explicitly outline security and testing obligations in request for proposal (RFP) documentation for third-party developers.

The Following Stats Reflect Key Issues Encountered During the Implementation Stage of SAP RISE Projects

of organizations are concerned that the skills deficit will slow down migration

hrs

New systems deployed in IaaS environments are exploited in as little as 3 hours.

As development begins, manual testing simply cannot keep up with the volume of code changes. The “Code, Build, and Test” phases require deep automation to prevent delays:

  • Interactive Code Analysis: Provide developers with real-time feedback in their IDE to identify security and quality errors while they are writing custom ABAP code.
  • Transport Inspection: Automatically scan SAP transports for missing objects, sequence errors, and vulnerabilities before they are imported into the QA or production environment.
  • Downgrade Protection: Ensure that new transports do not inadvertently overwrite newer objects or introduce functional deficits that break existing business processes.

To Effectively Mitigate These Risks and Address the Concerns Highlighted by These Statistics, Businesses Should Follow These Essential Steps:

hrs

The number of hours exploit activity can be observed after an SAP patch is released

USD

The average annual cost of business disruption due to non-compliance

Once the SAP S/4HANA system is live, the DevSecOps loop shifts to “Operate and Monitor” to defend the new digital core:

  • Continuous Threat Monitoring: Monitor network traffic, application logs, and user activity in real time to detect unauthorized access or malicious exploitation attempts.
  • Automated IT Controls Testing: Replace manual audit sampling with continuous, automated compliance testing for SOX, GDPR, and NIST frameworks.
  • Configuration Drift Prevention: Continuously assess the landscape to ensure that emergency fixes or unauthorized parameter changes do not weaken the S/4HANA security posture over time.

4 Keys to a Secure SAP S/4HANA Architecture

1. Map the Architecture Before Moving

Whether embarking on a Greenfield, Brownfield, or Bluefield deployment, an exact map of your active custom code and data dependencies is required. Do not migrate “dark code” (unused objects) into your new high-performance SAP HANA database.

2. “Shift Left” in Development

Finding a vulnerability or sequence error in the production environment is exponentially more expensive to fix than finding it in development. Integrate automated code scanning directly into the developer’s workflow to fix issues before they compile.

3. Establish a Clean Core Strategy

SAP strongly advocates for a “Clean Core” approach to S/4HANA, meaning customizations should be decoupled from the core ERP (often utilizing SAP BTP). Security tooling must be able to validate that core integrity is maintained through the migration.

4. Replace Manual Approvals with Automation

Digital transformation projects run on strict deadlines. Relying on a human basis team or security team to manually review every line of code, patch, and transport creates a massive bottleneck. Automation is the only way to scale S/4HANA operations.

Reduce Risk and Avoid Security Roadblocks on Your Journey to SAP S/4HANA with Onapsis’s Automated solutions designed for SAP

faster code reviews
faster patch validation
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automation of controls testing
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Frequently Asked Questions

SAP has set a primary deadline of 2027 (with extended support available until 2030 in some cases) for the end of mainstream maintenance for legacy ERP systems like SAP ECC. Failing to migrate before this deadline leaves critical business operations running on outdated, unpatched infrastructure.

SAP HANA is the underlying high-performance, in-memory database technology. SAP S/4HANA is the comprehensive enterprise resource planning (ERP) business suite built exclusively to run on that database.

The three primary architectural approaches are Greenfield (starting completely from scratch), Brownfield (converting the existing SAP ECC system), and Bluefield (a hybrid, selective data transition that leaves behind unused legacy code).

RISE with SAP operates on a shared security model where SAP secures the underlying cloud infrastructure, but the customer remains fully responsible for securing application-level configurations, custom code, and user access.

Decades of custom ABAP code often harbor obsolete functions and critical vulnerabilities. Auditing this code prevents legacy structural flaws from entering your modernized S/4HANA core, helping you achieve a “Clean Core.”