SAP S/4HANA Migration: What Buyers Should Plan For
For buyers
3 min read
SAP S/4HANA Migration: What Buyers Should Plan For
A guide for enterprise buyers on navigating the SAP S/4HANA migration, focusing on strategic planning, path selection, and mitigating commercial risks before the 2027 deadline.
The 2027 deadline for SAP ECC mainstream support is no longer a distant concern; it is an operational reality [1][3][5]. With extended maintenance available only at a premium until 2030, procurement and IT leaders must treat the migration to SAP S/4HANA as a mandatory, deadline-driven transformation rather than a routine upgrade [1][5][8].
Understand the migration paths
Every migration begins with choosing a path based on how much of your current system is worth keeping [3][8].
Brownfield (System Conversion): You convert your existing ECC system in place, retaining configuration, data, and history [3][5]. It is typically the fastest and least expensive route, but it carries forward legacy technical debt and dirty data [1][6][8].
Most IT services RFPs get thin, generic responses because they ask the wrong questions. Here is a structure that gets you comparable proposals in two weeks.
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For buyers
Put it to work
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Greenfield (Reimplementation): You build a clean S/4HANA system from scratch, adopting standard processes [3][5]. This is the most transformative option, offering a clean core, but it requires more time, budget, and change management [1][6][8].
Selective Data Transition (Hybrid/Bluefield): A middle ground where you selectively migrate data and processes [3][5]. It offers granular control but requires specialized tooling and complex planning [5][8].
A common failure mode is setting a timeline before measuring the actual state of your environment [2][6]. A structured readiness assessment is the most effective way to de-risk the project [3][7].
1Run the SAP Readiness Check: This diagnostic identifies custom code, database size, and simplification requirements [5][7].
2Inventory Custom Code: Every custom object must be marked for retirement, remediation, or migration to the SAP Business Technology Platform (BTP) [6][8].
3Cleanse Data Early: Data quality is the most frequent cause of project delays [6][8]. Cleaning master data—such as merging customer and vendor records into the new Business Partner model—should happen before the migration, not during [6][8].
Manage commercial and governance risks
The commercial preparation should run alongside the technical project, not after [1]. SAP gains leverage as the 2027 deadline approaches, so locking in your baseline early is critical [1].
Baseline your usage: Document your FUE (Full Usage Equivalent) count and indirect access volume 9 to 12 months before the technical project begins [1].
Ring-fence indirect access: Negotiate digital access as a standalone item rather than bundling it into the conversion quote [1].
Model the full cost: Use the RISE with SAP TCO calculator to compare subscription models against on-premise options over a five-year horizon, accounting for annual escalators [1][4].
Your choice of System Integrator (SI) often determines the outcome more than the technology itself [4]. When evaluating partners, look beyond the pitch deck [4].
Demand transparency: Ask for the specific consultants who will work on your project, their certification levels, and references from projects at your scale [4].
Clarify the governance model: Ensure the partner has a clear framework for when to allow custom ABAP development versus using standard SAP extensibility [4].
Define the hypercare model: Establish clear SLAs for the first 90 days post-go-live to ensure a smooth transition from build to run [4].
What this means for buyers
The 2027 deadline is a commercial weapon that can strip your negotiating leverage if you wait too long [1]. To protect your organization:
1Start the commercial baseline now: Lock in your license and indirect access baseline 9 to 12 months before the technical build [1].
2Fund data prep adequately: Allocate 25% to 30% of your total project effort to data cleansing and master data management [6].
3Engage independent advisory: Use third-party experts to benchmark pricing and validate the SI’s proposed path before signing any Statement of Work [1][4].
4Phase the commitment: Avoid committing to full volume early; align your license ramp to actual adoption [1].
5Prioritize reporting continuity: Identify which reports will break during the move and plan their migration early to avoid post-go-live disruptions [6].
