✏️ Explanatory Question
Why it matters
Excess custom code is the main reason organisations struggle to upgrade later.
What it is
Custom code is governed through development standards, code review, a register of custom objects, and tools such as the custom code migration app that identify which objects are still used and which conflict with S/4HANA.
How to act on it
Learn to challenge custom requirements in workshops by asking what the standard process cannot do. Reducing custom code is a measurable contribution clients remember.
What to learn next
Create a simple architecture view showing the user experience, application layer, extensions, integrations, identity and security, data movement and release lifecycle. Then practise tracing one requirement through that landscape, including where it should be configured, where code is justified, how it is transported and how it will be monitored after release. The value is in understanding the whole lifecycle, not only the product label.
Common mistakes to avoid
Avoid memorising marketing terms or feature lists without understanding constraints and trade-offs. Clients care about upgrade safety, supportability, security, performance and total ownership cost. Another mistake is assuming every technical possibility is a good design; modern SAP work rewards the smallest maintainable solution that meets the requirement and preserves a clean, supportable core.
How this shows up in interviews and on the job
Expect interviewers to ask where a solution belongs, what could fail, how access is controlled and how upgrades affect it. On the job, you will need to explain technical choices to functional consultants and business stakeholders in plain language, document dependencies, test failure paths and leave enough monitoring information for the support team to diagnose incidents quickly.