---
title: SAP S/4HANA upgrade testing pitfalls | qventis blog
description: "Custom code that compiles but behaves differently, Fiori apps replaced by successors, interfaces tested only on stubs: the S/4HANA upgrade pitfalls we see."
---

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# SAP S/4HANA upgrade testing pitfalls

Custom code that compiles but behaves differently, Fiori apps replaced by successors, interfaces tested only on stubs: the S/4HANA upgrade pitfalls we see.

qventis teamSeptember 11, 2026

SAP S/4HANA Cloud, public edition, moves on SAP's calendar: two releases a year plus regular feature packs. Private cloud and on-premise customers choose when to upgrade, but the work of an upgrade is similar either way. SAP publishes What's New content, simplification items and deprecations. Your team has to work out what they mean for a system that has usually been extended and integrated for years.

The pitfalls below come up again and again. Each one is avoidable, and each one has a common root: testing the system as SAP delivers it rather than as your business runs it.

## Test processes, not transactions

Upgrade test packs often start as lists of transactions and Fiori apps, each tested on its own. That misses the places where things actually break: the handoff from a sales order to a delivery, from a goods receipt to invoice verification, from a journal entry to period close. Organize the pack around the business process chains you run.

1. **O2C**Order to cash
2. **P2P**Procure to pay
3. **R2R**Record to report
4. **P2Pr**Plan to produce
5. **I2F**Inventory to fulfil
6. **A2R**Acquire to retire

A chain test that creates a sales order, delivers it, bills it and checks the accounting document will catch a pricing, output or posting change that a dozen isolated tests would miss.

## Pitfall one: custom code that compiles but behaves differently

In private cloud and on-premise systems, custom ABAP is usually the largest source of upgrade risk. The standard tools help: the ABAP Test Cockpit and custom code analysis flag syntax problems, use of simplified objects and calls to APIs that are no longer released. Teams fix the findings and consider custom code done.

A clean check result means the code is compatible. It does not mean it does what the business expects. An enhancement that reads a field SAP now fills differently will still compile. A report built on a table that changed meaning will still run. The only way to know is to execute the processes that pass through the custom code and check their results.

- Map each enhancement, BAdI implementation and custom report to the process step it affects
- Make sure at least one chain test passes through each of those steps
- Check expected results downstream of the custom code, not just that the step completes

In public cloud, the same logic applies to custom fields, custom logic and anything built with key user tools. They are smaller in scope but just as easy to forget.

## Pitfall two: Fiori changes treated as cosmetic

Fiori changes are easy to underrate because they look like interface work. They are often more than that.

- **Apps replaced by successors.** A deprecated app gets a new version with a different flow, fields or defaults
- **Business roles and catalogs.** New apps must be added to roles, spaces and pages, or users cannot reach them
- **Changed defaults.** Output and workflow defaults can change in ways that affect what users and partners receive
- **Mixed channels.** Some users still work in SAP GUI while others use Fiori, and both paths need coverage

A useful rule: for every app SAP marks as deprecated with a successor, write down which of your users and processes use it today, and test the successor with those users' roles before the upgrade, not after.

## Pitfall three: interfaces tested only against stubs

S/4HANA rarely stands alone. It exchanges IDocs with warehouses and partners, calls and exposes APIs to CRM and e-commerce, sends files to banks and receives them from carriers. During an upgrade, interface testing is often reduced to checking that messages leave the system in the expected format, against a stub.

Stubs are valuable for isolating the core. They cannot tell you whether the bank still accepts the payment file or the warehouse still processes the delivery. Plan at least one full round trip for each critical interface, and pay particular attention to:

- APIs SAP has deprecated in favor of successors, and every integration still calling them
- Output changes that alter the content or timing of documents sent to partners
- Middleware mappings that depend on fields whose meaning changed

## Pitfall four: authorizations discovered on day one

Upgrades change authorization objects, add apps and retire transactions. If roles are not updated and tested with real user profiles, the first sign of trouble is a flood of access requests on the morning after go-live. Test each critical process with the roles real users hold, not with a broad test user who can do everything.

## Pitfall five: period-end left untested

Upgrades are often scheduled mid-month, and test cycles follow the calendar. Month-end and quarter-end activities, such as accruals, revaluations, settlements and close tasks, get skipped because "it's not period end yet". Simulate a close in the test system before every upgrade. The first real close after an upgrade is the wrong place to find a problem.

## A short checklist

- Read What's New, simplification items and deprecations for every area you use
- Map each change and each custom object to the process step it touches
- Run chain tests through every step that carries custom code
- Test Fiori successors with real business roles
- Run full round trips for critical interfaces
- Simulate a period close before go-live

## How Qventis One helps

Qventis One follows the SAP Release Train. Release Intelligence reads What's New, feature pack notes and deprecations as SAP publishes them, and the App Model traces each change and each custom object to your O2C, P2P, R2R and other process steps. The Qventis Engine runs the test delta on Fiori apps and SAP GUI transactions from the same plain-English steps, blockers and end-to-end chains first, and Quality View gives a signed go or no-go per tenant before production upgrades. [Book a demo](https://qventis.ai/contact#demo) to map your next upgrade.

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