For many organisations, 2026 is no longer about whether to move to Cloud ERP (S/4HANA) Public but how and how quickly. With mainstream support for SAP ECC ending in December 2027, the window for a controlled migration is narrowing. Delay now leads to higher costs, fewer skilled resources and greater operational risk.
What often catches leadership teams out is that a Cloud ERP (S/4HANA) Public migration is not a technical upgrade. It is a business transformation that affects data, processes, operating models and governance. In our experience, the most common SAP Cloud ERP (S/4HANA) migration challenges are predictable but only if you know where to look.
Below, we outline the seven most critical Cloud ERP (S/4HANA) Public migration challenges in 2026, alongside proven best practices and examples from our work with organisations navigating these challenges.
#1
Data Quality, Cleansing and Migration Risk
Poor data remains the single greatest risk in SAP cloud ERP (S/4HANA) Public migration. Legacy environments often contain decades of duplicated, incomplete or obsolete data. When this data is moved into an in memory platform such as Cloud ERP (S/4HANA), underlying issues surface immediately.
Inaccurate master data leads to unreliable reporting, broken processes and operational disruption after go live. Despite this, many projects continue to underestimate the effort required to clean and govern data before migration.
Best practice: Establish data governance early
Successful projects treat data as a business asset, not a technical afterthought. This includes:
- Cleansing and de duplicating data before migration begins
- Agreeing field level definitions with accountable business owners
- Running incremental validation cycles instead of one off checks
- Embedding governance controls to prevent data degradation after go live
Birchman in practice: DBS S/4HANA project recovery
When David Brown Group went live with an incomplete Cloud ERP (S/4HANA) Public environment, missing data and configurations left the business exposed. Birchman was engaged under significant time pressure.
We assessed the landscape, identified critical data gaps and completed essential migration activities at pace. The result was a stabilised system that met the original separation deadline and protected business continuity.
This reflects a common pattern in SAP Cloud ERP (S/4HANA) Public migration challenges. Data issues rarely resolve without intervention but they can be addressed effectively with the right focus and governance.
#2
Business Process Complexity and Resistance to Change
One of the most underestimated Cloud ERP (S/4HANA) Public migration challenges is process design. Too often, organisations try to replicate legacy processes rather than adopt standard SAP ways of working. This increases customisation, cost, long term risk and maintenance effort.
At its core, migration to Cloud ERP (S/4HANA) Public is a decision about how the business intends to operate in the future.
Best practice: align process redesign with SAP Activate
A structured, business led approach delivers more predictable outcomes:
- Run early discovery workshops with senior stakeholders
- Prioritise high impact processes such as finance and supply chain
- Use standard SAP processes as the baseline
- Validate designs iteratively, not at the end
Birchman in practice: Alfrecell’s 12 week transition
Alfrecell faced a hard deadline to separate from a multinational ERP landscape. There was no time for over engineering. Birchman worked side by side with the business to align on standard processes early and avoid unnecessary complexity.
Alfrecell moved from ECC to S/4HANA Cloud in just 12 weeks, without disrupting day to day operations. This illustrates how process simplification reduces delivery risk in SAP cloud ERP migration.
#3
Skills Shortages and Resource Constraints
By 2026, shortages of experienced Cloud ERP (S/4HANA) Public specialists are affecting most projects. Demand is particularly high for data migration, finance, testing and cutover roles. In the UK and EU, this is further constrained by labour market conditions.
When these skills are missing at critical moments, delays multiply.
Best practice: build a blended delivery model
Resilient projects avoid reliance on a single sourcing approach and instead combine:
- Senior specialists for high risk phases
- Scalable delivery teams for build and testing
- Automation and delivery tools to reduce manual effort
- Structured knowledge transfer to internal teams
#4
Organisational Resistance and User Adoption
A technically successful Cloud ERP (S/4HANA) Public migration can still fail if users do not adopt the system. Resistance often appears in the form of workarounds, spreadsheets or shadow systems. Training alone does not solve this.
Best practice: embed change management throughout
Effective change projects typically include:
- A clear executive narrative linked to business outcomes
- Change champions embedded within each function
- Structured hypercare after go live
- Ongoing communication beyond launch
#5
Timeline Pressure and Budget Constraints
As the 2027 support deadline approaches, many organisations are working with compressed delivery schedules. This places pressure on budgets, stretches internal teams and limits contingency.
Best practice: focus on Clean Core delivery
Under constrained timelines, risk is reduced by:
- Design for standard SAP functionality first
- Minimise customisation
- Run workstreams in parallel where possible
- Reduce data volumes prior to migration
#6
Integration Complexity in Hybrid Landscapes
Most organisations operate hybrid system landscapes. During Cloud ERP (S/4HANA) Public migration, integration weaknesses often surface for the first time. Point to point integrations become fragile and difficult to manage.
Best practice: modern integration architecture
A sustainable approach includes:
- API first integration design
- Side by side extensibility
- Central integration governance
Birchman designs integration as part of the target operating model rather than as a separate technical task. This supports future change and reduces long term maintenance effort.
#7
Security, Governance and Compliance Readiness
Migration to Cloud ERP (S/4HANA) Public changes how security and compliance are managed. When these topics are delayed, post go live risk increases.
Best practice: embed governance into migration planning
Strong projects include:
- Early risk and compliance assessments.
- Role based access and segregation of duties
- Ongoing monitoring and audit readiness
Turning Cloud ERP (S/4HANA) Public Migration Challenges into Confidence
The most common SAP Cloud ERP (S/4HANA) Public migration challenges, including data quality, skills shortages, process complexity and time pressure, are well understood in 2026. The differentiator lies in execution.
At Birchman, we focus on proven methodologies with measurable results. Whether stabilising a complex project or delivering a Cloud ERP (S/4HANA) Public transition, we support organisations in moving forward with confidence.
Talk to our experts about planning your Cloud ERP (S/4HANA) Public migration or explore our case studies to see how we support transformation at critical points.
FAQs
Question #1: Should we choose Cloud ERP (S/4HANA) Public or Private?
Ans: It depends on how much standardisation your business can adopt. Cloud ERP Public supports faster deployment and lower cost. Cloud ERP Private offers greater flexibility for complex or regulated environments. The decision should align with your operating model, not just IT preference.
Question #2: Can we migrate to Cloud ERP (S/4HANA) Public in phases?
Ans: Yes. Many organisations reduce risk by migrating in phases. Starting with a pilot business unit or geography allows early validation and smoother scaling across the enterprise.
Question #3: How does Cloud ERP (S/4HANA) Public support sustainability and ESG goals?
Ans: S/4HANA Cloud improves data transparency and real time reporting. This creates a reliable foundation for tracking sustainability metrics and supporting ESG reporting when combined with SAP’s sustainability tools.
Question #4: What happens to custom ABAP developments during migration?
Ans: Custom code is reviewed and rationalised. Some developments are retired, others replaced with standard functionality and remaining extensions are often moved outside the core to reduce future risk.
Question #5: How should success be measured after go live?
Ans: Success goes beyond system stability. Key measures include user adoption, process efficiency, faster close cycles and reduced reliance on manual workarounds.
