Migrate to S/4HANA without the risk
The 2027 SAP ECC end-of-mainstream-maintenance deadline is fixed. Organisations that migrate on a planned timeline control the outcome. Those that wait face compressed timelines, premium partner rates, and the operational risk of a rushed cutover. BCS delivers SAP S/4HANA migrations that preserve business continuity while retiring the technical debt that has been holding the roadmap hostage.
30-minute discovery session.
SAP ends mainstream ECC maintenance in December 2027, with extended support to 2030 (SAP).
Majority of S/4HANA migrations carry ABAP modifications that constrain clean-core upgrade adoption (Gartner).
Majority of S/4HANA migrations face schedule slippage from custom code or data quality issues (Gartner).
Which migration path fits the landscape?
The right approach depends on the state of the ECC landscape, the volume of customisation, and how much of the current process model should be preserved versus redesigned. BCS delivers both, with the same clean-core discipline and assessment rigour applied regardless of the path chosen.
Every BCS migration starts with a structured assessment: actual custom code object count, data quality profile, integration inventory, and a timed cutover simulation. Scope is priced on evidence, not market benchmarks. Whether the programme follows a brownfield system conversion or a selective data migration, the outcome is the same — a clean-core S/4HANA system with technical debt permanently retired and Symphony automation live from go-live.
The failure modes that turn migrations into crises
SAP S/4HANA migrations are among the most technically and operationally complex programmes in enterprise IT. The failure modes are well documented and largely consistent across organisations. What distinguishes the programmes that land from those that do not is whether these patterns were addressed before technical execution began.
What the board gets from a successful S/4HANA migration
Migrating to S/4HANA is the most consequential SAP investment an organisation will make this decade. The business case is not just about keeping the lights on beyond 2027. It is about the new operating model that sits on the other side of the migration window.
A future-proof platform before the 2027 deadline
SAP ECC mainstream maintenance ends in 2027. Organisations that migrate on a planned schedule avoid extended maintenance premiums, constrained partner availability, and the operational risk of a deadline-driven migration.
Real-time operational visibility
The Universal Journal, embedded analytics, and live MRP replace the batch-heavy, report-intensive operations model of ECC. Decisions are made on current data, not last night's extract.
Technical debt retired permanently
An average BCS migration retires 55% of the legacy custom code base, eliminating the upgrade friction, security risk, and maintenance cost that has accumulated over the ECC lifetime.
Compliance rebuilt on a modern foundation
Anugal embeds continuous controls monitoring into the new S/4HANA system from cutover, replacing the manual compliance processes built around ECC limitations.
Roadmap unlocked
A clean-core S/4HANA system accepts every future SAP innovation, AI, embedded automation, industry cloud, without re-implementation. The migration pays forward for a decade.
Operational efficiency from day one
Symphony agents are deployed at cutover to absorb routine workloads in the new system. Stabilisation is supported by automation, not headcount spikes.
How does BCS deliver an S/4HANA migration?
Migration is a high-risk programme on a fixed deadline. BCS structures every S/4HANA migration as six phases where the custom code, data quality, and process simplification decisions in the first three phases determine whether the cutover window holds. Everything after that is execution.
Migration Assessment
BCS profiles the custom code, data quality, integration landscape, and cut-over complexity using SAP Readiness Check alongside BCS analysis tooling. Migration risk is quantified before scope and price are committed.
Architecture and Design
The target S/4HANA architecture, clean-core extension design, integration re-architecture, and migration path (brownfield, bluefield, or greenfield) are confirmed. Every decision is anchored to the Readiness Check findings, not vendor assumptions.
Data Quality Programme
Legacy data is profiled, cleansed, deduplicated, and enriched as a parallel workstream before the migration window opens. Data quality is treated as a programme gate, not an assumption that can be revisited later.
Technical Migration
SUM with DMO runs the brownfield system conversion, or LTMC orchestrates selective data migration. Custom code is remediated, configuration transferred, and Universal Journal activated in the new platform.
Testing and Cutover Rehearsal
End-to-end regression, integration, and performance testing run in sequence. Multiple full-cycle cut-over rehearsals validate the production timeline with measured durations and fallback decision points.
Go-Live and Hypercare
Production cut-over runs with reconciliation sign-off, structured hypercare, and severity SLAs. Symphony agents absorb the L1/L2 peak that follows every major migration, freeing BCS architects for complex problem management.
Migration expertise across every S/4HANA workstream
BCS migration practice covers every technical and functional dimension of a complex S/4HANA programme, from custom code remediation and data quality through integration cutover and the Symphony-augmented operating model that is live on day one. Every capability below is a scoped workstream with defined deliverables, not a background task.
Custom Code Assessment & Remediation
Automated custom code impact analysis using SAP's Custom Code Migration app and BCS tooling. Every Z-program, enhancement spot, BAdi implementation, and implicit enhancement assessed and classified, retire, refactor as BTP extension, or carry forward under clean-core rules.
Data Migration Programme
LTMC, LTMOM, and custom migration object design. Legacy data quality programme, migration cockpit configuration, and reconciliation reports that sign off each load.
Universal Journal Migration
FI, CO, and Asset Accounting migration to the Universal Journal. Period carry-forwards, open item transfers, and balance validation against the legacy system.
Integration Re-architecture
Third-party and satellite system integration re-routing to the new S/4HANA APIs. PO to CPI migration where applicable, BCS holds full CPI implementation capability.
Embedded Analytics Activation
CDS views, SAP Analytics Cloud connectivity, and Fiori analytical apps activated on the new platform. Reporting modernised as part of the migration, not deferred.
Cutover Planning & Execution
Technical cutover sequence, fallback decision criteria, parallel run architecture, and reconciliation scripts. Multiple dress rehearsals with measured window durations before production cutover.
S/4HANA Brownfield Conversion
System conversion using SUM with DBACOCKPIT optimisation. Downtime minimisation, custom transport import sequencing, and post-conversion activation of S/4HANA simplifications.
SAP Fiori Activation
Fiori launchpad configuration, tile setup, and role-based UX activation across migrated business processes. UX improvement delivered as part of the migration programme.
Post-Migration Hypercare
Structured hypercare with daily triage, severity SLAs, performance monitoring, and Symphony-augmented L1/L2 resolution. Stabilisation designed as a programme phase, not an informal period.
What other SAP migration partners cannot offer
Most migration partners deliver a new system. BCS delivers a new operating model alongside it. Symphony, deKorvai, and Anugal are scoped during migration design and deployed at cutover, so the business operates at a higher baseline from day one rather than waiting for a follow-on programme that may never arrive.
Agentic Operations Platform
Symphony
Symphony agents are deployed at migration cutover, autonomously absorbing the operational workload in the new S/4HANA environment from the first production day. Approvals, exceptions, and period-end tasks that previously required manual handling run without human triage, reducing the hypercare staffing burden migrations typically generate.
- Deployed at cutover to absorb operational workload immediately
- Autonomous exception handling in the new S/4HANA environment
- Period-end close automation active from first close post-migration
- Support ticket deflection at L1/L2 during hypercare
AI Decision Intelligence
deKorvai
The data that arrives in S/4HANA after migration is cleaner and better structured than anything in ECC. deKorvai is built to extract intelligence from it immediately, turning the migration into the starting point for predictive operations rather than just a platform change.
- Post-migration anomaly detection across migrated transaction history
- Demand and inventory signal sensing active from go-live
- Predictive analytics replacing the ECC batch reports retired by migration
- Cash flow forecasting on the Universal Journal from day one
Compliance & Controls Automation
Anugal
Migration is the right moment to reset the compliance posture. BCS deploys Anugal at cutover to monitor SoD compliance against the new S/4HANA role design, collect audit evidence from the first period, and eliminate the access control gaps that accumulate silently across long-running ECC landscapes.
- Continuous SoD monitoring from cutover, not quarterly reviews
- Automated audit evidence collection in the new S/4HANA system
- Access risk analytics applied to the post-migration role design
- Compliance reporting rebuilt on S/4HANA from the first period
Frequently Asked Questions
Refer to this section for answers to frequently asked questions related to SAP S/4HANA migration.
What is the difference between brownfield, bluefield, and greenfield migration?
How long does an S/4HANA migration typically take?
What happens to existing custom ABAP code (Z-programs) during migration?
Does the 2027 ECC deadline mean migration must finish by 2027?
Can the cutover happen over a single weekend?
What makes BCS different for S/4HANA migrations?
12 years of SAP delivery across 40+ enterprise programmes, including brownfield conversions, selective data migrations, and multi-entity cutover programmes, is what sits behind BCS migration methodology. That experience is why the approach is built around prevention rather than crisis management.
Assessment before execution, always
BCS runs a structured migration assessment before any technical work begins. Custom code volume, data quality state, integration complexity, and cutover risk are quantified before the project is scoped and priced.
Data quality is a gate, not a task
Data migration is the most common cause of migration delays and post-go-live defects. BCS runs a parallel data quality programme from the start of the project, data is clean before the migration begins.
Custom code retirement is an outcome
Most partners migrate custom code. BCS retires it. An average 55% of legacy custom objects are replaced with standard S/4HANA functionality or refactored as clean-core BTP extensions, permanently eliminating future upgrade friction.
Cutover rehearsed, not assumed
Multiple full-cycle cutover rehearsals with measured durations, fallback decision checkpoints, and reconciliation sign-off before production cutover. The cutover window is a known quantity, not a projection.
Automation covers the stabilisation peak
Symphony agents are deployed at cutover. The L1/L2 support load that peaks in the first 90 days post-migration is absorbed by automation, protecting the business from the operational disruption that typically follows a major system change.
Migration scope is priced on evidence, not benchmarks
BCS scopes and prices migrations from a structured assessment: actual custom code object count, measured data volumes, documented integration endpoints, and a timed cutover simulation. Organisations do not receive a budget estimate built on industry averages that later requires significant revision.
Start the S/4HANA migration on the right timeline
The 2027 ECC maintenance deadline is fixed. The organisations that migrate on a planned programme control the outcome. Tell BCS where the programme stands and BCS will scope a migration programme that eliminates the risk and delivers the S/4HANA foundation the long-term roadmap requires.
30-minute discovery session.