Effective SAP S/4HANA migration requires accurate and clean data. Developers must ensure legacy data is free from inconsistencies, duplicates, and obsolete entries before migration begins. This article provides step-by-step guidance on how to prepare data, the tools to use, and best practices for maintaining data integrity throughout the SAP S/4HANA migration process. Learn how data cleansing accelerates implementation, minimizes system errors, and improves operational efficiency after go-live.