SAP Migration · 6 min read · July 2025
Why SAP S/4HANA migrations really fail, and it is not the software
By Thinklytics Partners, SAP S/4HANA Practice
Ask why an S/4HANA migration failed and people blame the software. They are almost always wrong. The platform works. What breaks is the data underneath it.
Topics covered
- S/4HANA
- Data Migration
- Master Data
- Migration Risk
Frequently asked questions
Why do S/4HANA migrations fail?
Most fail on data, not on SAP. The platform works. Migrations stall on poor master data, duplicates, dark data, custom code that breaks against the simplified data model, and reporting that goes dark when the data moves. 77 percent of organizations call data management their hardest part of the move.
Is the SAP software the problem?
Rarely. The S/4HANA platform and the migration tooling are mature. What varies between programs is the condition of the data going in and the reporting that depends on it, which is where most failures actually start.
What does the data actually look like after years on ECC?
Ungoverned. Duplicate customers, vendors, and materials, inconsistent units of measure, missing fields, broken classifications, and a thicket of custom code nobody fully maps anymore.
How do we avoid a failed migration?
Measure readiness before you commit to a date, clean the data before you move it, keep the data workstream staffed with senior people, and plan reporting continuity as part of the migration rather than after it.
How much of a migration should be data work?
Best practice puts 25 to 30 percent of total migration effort into data preparation and validation. Teams that treat it as an afterthought reliably hit rework and cutover delays.
When does ECC support end?
Mainstream maintenance ends in December 2027, extendable to 2030 at a premium. Start early so you choose your path instead of the calendar choosing for you.