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Published
July 2026

How an Enterprise Proved a Regression-Free SAP Migration

An enterprise facing SAP ECC end-of-support replayed real production data through the reference design and the migrated system, surfacing regressions before cutover, not after.

Zero regressions

Proven before go-live cutover

Not disclosed

Implementation Time

Not disclosed

Project Cost
the challenge

The enterprise faced SAP ECC end-of-support and had to migrate to S/4HANA. The core risk was silent regressions, where downstream processes break or diverge without anyone noticing during the transformation.

what they built

TrustEvals applied a reference-design approach to validate equivalence between the old and new systems. Production data is replayed to confirm the migrated environment reproduces the same results, providing evidence that nothing regressed before cutover.

Equivalence is proven by replaying real production data through both the reference design and the migrated system and comparing outputs, so regressions surface before go-live rather than after.

best fit for

Best fit for enterprises facing a forced ERP migration deadline that must prove, with evidence, that the new system behaves identically to the old one.

Ai ROLE
The approach is a reference-design equivalence validation rather than a model-driven build. Real production data is replayed through both the legacy ECC reference design and the migrated S/4HANA system, and outputs are compared to catch silent regressions before cutover. No AI model or approach is established in the source.
impact

Equivalence proven

A reference design validates that the old and migrated systems produce the same results.

Production data replay

Real production data is replayed to catch regressions before cutover.

Deadline-driven confidence

Addresses the SAP ECC end-of-support deadline with evidence that nothing regressed.

Unmukt Raizada

Founder & CEO, TrustEvals
TrustEvals
Founder & CEO of TrustEvals. Builds AI evaluation and governance infrastructure for finance, real estate and regulated software — eval harnesses, semantic data dictionaries, and AI audits.
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frequently asked questions
How can an enterprise prove nothing regressed in a SAP ECC to S/4HANA migration?

The enterprise worked with the experts, who applied a reference-design approach that validates equivalence between the legacy and migrated systems. Real production data is replayed through both and outputs are compared, so regressions surface before go-live rather than after, giving evidence that nothing regressed before cutover.

What approach was used to regression-proof the SAP S/4HANA migration?

The approach is reference-design equivalence validation with production-data replay: real production data is run through both the reference design and the migrated S/4HANA system and the outputs are compared to detect regressions. No specific AI model or vendor is established in the record.

What results did the SAP migration achieve?

A reference design validates that the old and migrated systems produce the same results, real production data is replayed to catch regressions before cutover, and the work addresses the SAP ECC end-of-support deadline with evidence that nothing regressed.

How long did the SAP migration validation take?

The record does not specify a timeline for the migration or validation work.

Who is production-data replay migration testing best for?

It is best suited to enterprises facing a forced ERP migration deadline that must prove, with evidence, that the new system behaves identically to the old one.

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