Why System Migrations Cause Sleepless Nights Early On

Companies are repeatedly faced with the decision to replace aging systems. Often, this does not concern just some peripheral application but real core systems – that is, systems deeply embedded in processes, roles, and responsibilities. This is particularly noticeable with ERP systems.

The reasons for this are varied. Sometimes requirements have shifted. Sometimes the existing ERP no longer fits the evolved organization. And sometimes, a large provider simply creates facts by phasing out support – as is currently the case with the transition from SAP ECC to SAP S/4HANA. SAP has clearly communicated the end of maintenance: Regular support ends in 2027, and a paid Extended Maintenance lasts until 2030. For many medium-sized enterprises, this is the concrete trigger for a migration project they have long anticipated.

At this moment, the issue is present. And along with it comes the reaction that many experienced managers know all too well: Nervousness, internal pressure, and sleepless nights.

Not because everything escalates operationally right away. Initially, surprisingly little happens. The time horizon still seems long, the topic is on the roadmap, and the decision has already been made. This should actually be reassuring. But it is not.

Because those who are familiar with such programs know how they unfold in reality. The sheer size of the project, the number of stakeholders, dependence on specialist departments, uncertainty about the actual starting point, and the risk of costly delays mean that the migration looms over everyday life from the very beginning like a shadow. According to a study conducted together with ASUG, respondents cited changes to business processes (49%), adjustments (44%), and organizational resistance (37%) as the greatest obstacles.

And yet, often what makes these ventures so dangerous happens: Everyday life prevails. Other topics seem more urgent. Resources are tied up in day-to-day operations. The migration has been decided but does not get underway productively.

Until suddenly it becomes urgent. A glance at the calendar is enough, and what was a long-term project has turned into a tight time corridor. According to PAC analyses, 2026 will be a turning point for S/4 migrations. Migration projects typically take 12 to 24 months. Those still in preparation in 2026 will feel the pressure immediately.

By then, the real problem becomes apparent: It is not the target system that causes the greatest pain, but the inadequate preparation for the migration.

Companies must know and document their current processes before implementing ERP. They need to carry out a reliable stocktaking: clarifying roles and responsibilities, capturing system usage, making media breaks, special paths, and dependencies visible. As Computerwoche emphasizes in its analysis of the biggest hurdles, every successful migration project begins with a structured inventory of process mapping, system inventory, and data evaluation. Without this transparency, every migration strategy remains a blind flight.

Knowledge is distributed across departments, Excel files, email threads, side agreements, legacy systems, and in the minds of individual employees. Of course, all of this can be lifted manually – through workshops, interview series, and external consulting. But therein lies the problem: It is expensive, slow, and in critical programs, this time is often no longer available. Especially in medium-sized companies, where resources are limited and key users must simultaneously manage day-to-day operations, this phase becomes a real stress test.

How valuable would a solution be that prevents these sleepless nights from arising in the first place – or that captures the project again when it has become dangerously tight. That is exactly what BLIKS IO does.

How BLIKS IO Recovers Lost Time in Migration

BLIKS IO starts precisely where system migrations become critical for managers: at the phase when it suddenly becomes clear that there is no longer enough time, yet the preparation is still at a much too low maturity level.

Right now begins the most expensive reflex in many programs: even more workshops, even more interviews, even more external support. One tries to replace missing transparency with additional effort. Almost always too slow, too expensive, and too burdensome for the organization – and it drives migration costs up before the actual implementation has even begun.

BLIKS IO reverses this logic. Instead of painstakingly squeezing operational reality out of the organization, the platform makes it structurally visible – like a digital twin of your organizational processes.

BLIKS IO makes visible what is really happening today. Not just documented target processes, but the actual, everyday realities: real process variants, loops, exceptions, manual workarounds, and local detours – all that which is not reflected on any official process map. Whether the goal is a clean core based on SAP Best Practices or a pragmatic brownfield approach – without reliable current data, every target architecture becomes speculation.

BLIKS IO shows who is really involved. Where are approvals, special cases, and experiential knowledge dependent on individual people? BLIKS IO makes roles, involvement, and responsibilities visible. Especially for key users who carry a dual burden of day-to-day business and project work during the migration, this clarity is invaluable.

BLIKS IO makes the system landscape and media breaks tangible. Legacy systems, Excel logic, shadow solutions, and manual interfaces develop over years – and often only become fully visible during the project. BLIKS IO shows which systems are used where and which dependencies must be taken into account in the migration. This is particularly relevant for the question of how much custom code is actually still business-critical.

BLIKS IO prepares fit-to-standard robustly. Fit-to-Standard is one of the points where many S/4HANA projects go awry – not because the method is wrong, but because it becomes a matter of opinion without clean current data. SAP's clean core philosophy makes this transparency even more crucial than in previous ERP generations. Those who have recorded how the organization actually works today can decide clearly: What will be adopted in a standard manner, what needs to be adjusted, and which special logics have historically evolved but are no longer sensible today?

Classically, companies lose weeks or months in discovery, scoping, and fit-to-standard. According to PwC, 82 percent of companies that have already implemented S/4HANA realize a positive business case – but the path there is often rockier than planned. BLIKS IO accelerates precisely these pre-phases. And that is the point where sleepless nights turn back into management capability.

Why Poor Processes Become Even More Expensive in the New System

A new ERP does not automatically improve poor processes. It often only makes them more binding.

If accumulated friction losses, unnecessary loops, manual workarounds, and unclear responsibilities migrate unchecked into the new system, there is no fresh start. Instead, as expert warns, a new system with old logic, high complexity, and rising operational costs emerges. Poor processes are digitally re-anchored rather than improved. Historical special logics and unnecessary custom code adaptations move into the target architecture. Scope decisions are based on assumptions rather than on real data. Test phases become imprecise, go-live and hypercare come under unnecessary pressure. And external consulting costs rise because knowledge must repeatedly be re-acquired.

This is particularly evident with S/4HANA. The simplified data model and the stricter consistency logics of the HANA database expose problems that were carried along for years in the old ECC system. Those who start late and purchase transparency solely through classic workshops and consultant capacities often pay double: with money and time.

Why the Choice of Migration Strategy Becomes a Matter of Luck Without Current Transparency

Companies switching from SAP ECC to S/4HANA face a fundamental strategic decision: Greenfield, Brownfield, or a hybrid approach?

In the Greenfield approach, S/4HANA is implemented completely anew – maximum freedom but also maximum effort in redesign and change management. In the Brownfield approach, the existing ECC system is technically lifted to S/4HANA – faster, but with the risk of transferring legacy issues into the new system. The hybrid approach – often referred to as selective data transition or bluefield – combines elements of both strategies.

What all three paths have in common: Without a clean inventory of the real processes, systems, and responsibilities, the right migration strategy cannot be chosen on a solid basis. Those who do not know how much custom code is actually business-critical and what legacy systems and shadow solutions are in use make this decision based on assumptions.

BLIKS IO provides exactly this factual basis – quickly, structured, and independent of the later choice of the migration approach.

Request a Demo

If your ERP or S/4HANA migration is more tightly scheduled than planned, now is the right time to recover lost time in the right places. The end of maintenance for SAP ECC is approaching, project durations are long, and the preparation effort is often underestimated.

BLIKS IO helps you make your operational reality visible in the shortest time possible – before poor processes, unclear responsibilities, and hidden dependencies migrate into the new system.

Request a demo and check with us how to robustly capture processes, roles, systems, and dependencies before your migration – regardless of whether you choose greenfield, brownfield, or a hybrid approach.