SAP S/4HANA 2025 Simplification List Technical & Functional Analysis for Migration Projects
Introduction
Migrating to a new SAP S/4HANA release involves much more than applying software updates or adapting custom code. A successful migration begins by understanding the functional, technical, and architectural changes introduced by the target release and assessing their potential impact on the existing SAP landscape.
One of the most important references provided by SAP for this purpose is the SAP S/4HANA Simplification List.
The Simplification List documents hundreds of changes affecting business processes, data models, custom developments, APIs, integration scenarios, extensibility, and system architecture. It is an essential resource for architects, developers, functional consultants, and technical leaders involved in SAP S/4HANA migration projects.
However, due to its size and level of detail, transforming its content into practical guidance for real-world projects can be challenging.
As part of the preparation for a migration from SAP S/4HANA 2020 to SAP S/4HANA 2025, I conducted a comprehensive review of the SAP S/4HANA 2025 Simplification List and organized the information into a structured technical and functional guide.
The result is the document I am pleased to share with the SAP community.
Purpose of This Guide
The objective of this guide is to provide a structured interpretation of the SAP S/4HANA 2025 Simplification List, helping SAP professionals understand the migration landscape from both technical and functional perspectives.
Rather than replacing SAP's official documentation, this guide complements it by organizing the information into practical topics that support:
Enterprise Architecture
SAP Solution Architecture
Migration Planning
ABAP Modernization
Clean Core Strategy
Custom Code Assessment
Technical Governance
Risk Analysis
Test Planning
Technical Decision Making
The guide is intended for:
SAP Enterprise Architects
SAP Solution Architects
SAP ABAP Developers
Functional Consultants
SAP Basis Administrators
Integration Specialists
Technical Leads
SAP Migration Teams
What You'll Find in This Guide
The document includes:
SAP S/4HANA 2025 migration architecture.
Technical and functional analysis of key Simplification Items.
Relationship between Simplification List, SAP Readiness Check, and ATC.
Clean Core strategy.
Custom Code Migration considerations.
Module-by-module impact analysis.
Enterprise Architecture recommendations.
Technical governance practices.
Risk assessment matrices.
Migration decision workflows.
Testing strategy.
Practical ABAP migration examples.
Architecture diagrams.
Best practices gathered throughout the analysis.
Scope
This document represents an independent technical analysis prepared for educational purposes and professional knowledge sharing.
It is not an official SAP publication and should always be used together with SAP's official documentation, including:
SAP S/4HANA Simplification List
SAP Readiness Check
Maintenance Planner
SAP ATC
Custom Code Migration
Relevant SAP Notes
Official SAP Product Documentation
Every SAP landscape is different.
The actual migration impact depends on multiple factors, including:
Source SAP S/4HANA release.
Installed components.
Activated business functions.
Industry solutions.
Custom developments.
Integration landscape.
Business requirements.
Although this guide uses a migration from SAP S/4HANA 2020 to SAP S/4HANA 2025 as its reference scenario, the methodology, analysis approach, and many of the recommendations can also be applied to migration projects starting from other SAP S/4HANA releases.
Why I Decided to Share This Work
Throughout my experience, I have learned that successful SAP migration projects begin long before the first transport request is imported or the first line of code is modified.
They begin with understanding the target architecture, identifying potential risks, assessing technical impacts, and building a migration strategy based on reliable information.
That is why I decided to publish this guide.
My intention is to provide a practical reference that helps SAP professionals better understand the SAP S/4HANA 2025 Simplification List and supports the early planning stages of migration projects.
If this work contributes to reducing analysis time, improving technical discussions, or helping other professionals better understand SAP S/4HANA migration challenges, then it will have fulfilled its purpose.
Recommended Reading Order
To get the most value from both documents, I recommend the following sequence:
Read the Technical & Functional Analysis of the Simplification List to obtain a structured understanding of the most relevant functional, technical, and architectural changes.
Use the Official SAP Simplification List to validate release-specific details, implementation considerations, and SAP-supported guidance.
Together, these documents provide both a practical interpretation and the official technical reference needed to support SAP S/4HANA migration planning.
Available Resources
As part of this initiative, I am making the following documents available
📘 SAP S/4HANA 2025 – Technical & Functional Analysis of the Simplification List
This document contains my independent technical analysis of the SAP S/4HANA 2025 Simplification List, organized from an Enterprise Architecture perspective.
It includes:
Enterprise Architecture considerations.
Technical and functional impact assessment.
Clean Core recommendations.
SAP ATC and Custom Code Migration analysis.
Module-specific migration considerations.
Practical ABAP migration examples.
Governance, testing strategies, and implementation recommendations.
Download: SAP S/4HANA 2025 – Technical & Functional Analysis of the Simplification List
📙 SAP S/4HANA 2025 – Official SAP Simplification List
For reference purposes, I also provide access to the official SAP S/4HANA 2025 Simplification List published by SAP.
This document remains the authoritative reference and should always be consulted together with the analysis guide.
Download: SAP S/4HANA 2025 Official Simplification List
About the Author
Sergio Cannelli
Enterprise SAP Architect
Specialized in SAP S/4HANA Architecture, ABAP Modernization, Clean Core, SAP BTP, Enterprise Integration, and Artificial Intelligence applied to the SAP ecosystem.
Through SC | Enterprise SAP Architecture, I share technical articles, architecture guides, migration methodologies, implementation experiences, and practical resources to support SAP professionals in modernizing and evolving their SAP landscapes.
Final Note
This guide reflects my personal technical analysis of the SAP S/4HANA 2025 Simplification List.
Its purpose is to help SAP professionals navigate the complexity of SAP S/4HANA migrations by providing a structured starting point for understanding the official SAP documentation.
Implementation decisions should always be validated against the official SAP documentation and the specific characteristics of each SAP landscape.
I hope this guide contributes to the SAP community by making the initial migration analysis more accessible and helping professionals approach SAP S/4HANA 2025 projects with greater confidence and a clearer technical perspective.
© Sergio CannelliSC | Enterprise SAP ArchitectureIndependent Technical Analysis – Knowledge Sharing Initiative
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