Thinklytics

Technology Hardware Company (representative) · Technology & SaaS · United States · 5 months

A stalled S/4HANA migration rescued to a clean go-live in 5 months

A representative engagement. The migration was stuck mid-program because the data mapping had failed and custom code kept breaking. Our Data Rescue Pod owned the workstream that had been the blocker.

Challenge

A roughly 1,900-person technology hardware company on SAP ECC was mid-migration with a global system integrator and badly behind. The data mapping had failed twice and custom ABAP kept breaking against the S/4HANA simplified data model. Legacy customer, material, and finance data was too dirty to load, and the integrator's data resources were junior and stretched. Every month the program slipped, the cost climbed.

Approach

We deployed a Data Rescue Pod into the live program. Our senior team mapped the legacy fields to the S/4HANA data model properly, rewrote the broken custom ABAP, and built automated ETL pipelines to cleanse and deduplicate customer, material, and finance master data. We validated the new Golden Record against business processes with the functional leads, reconciled every load against source, and rehearsed cutover with clear go and no-go criteria, working inside the integrator's governance.

Outcome

The migration that had been slipping for months reached a clean go-live with no operational downtime. The relationship with the primary integrator was preserved, and the client finally had a digital core built on data they could trust.

Senior people who had done this

After two failed conversions the program needed people who had been here before. Our veterans owned the data and code workstream that had been the blocker, and made it the part that held.

Fix the mapping and the code

We mapped legacy fields to the S/4HANA model properly and rewrote the custom ABAP that broke against the simplified data model, then built repeatable ETL cleansing pipelines.

A rehearsed, reconciled cutover

We validated the Golden Record against real business processes, reconciled every load, and rehearsed cutover with go and no-go criteria, so the go-live was calm and clean.

Results

  • 5 mo From rescue mobilization to clean go-live
  • 2 to 1 Failed loads turned into one clean cutover
  • Zero Operational downtime at go-live
  • $500K+ Projected overrun and penalty exposure avoided

We were two failed conversions deep and losing faith. Thinklytics brought in senior people who had actually done this, owned the data and the broken code, and got us live. They were the difference between a rescue and a write-off.

ERP Program Director, Technology hardware company (representative)

In the client's terms

The question

What stops reconciling the day we cut over?

The situation

A technology hardware company of around 1,900 people was mid-migration with a global integrator and badly behind. Data mapping had failed twice, custom ABAP kept breaking against the simplified S/4HANA data model, and legacy customer, material and finance data was too dirty to load. Every month of slippage added cost.

What we found

The integrator's data resources were junior and stretched, which is why the same mapping failed twice. The programme did not need replacing, it needed senior data capability inserted into it, and replacing the integrator would have restarted the clock rather than stopped it.

What it produced

A migration that had slipped for months reached a clean go-live with no operational downtime. Two failed loads became one clean cutover. The relationship with the primary integrator was preserved, and projected overrun and penalty exposure of over $500K did not materialise.

The roadmap

A Data Rescue Pod went into the live programme and worked inside the integrator's governance. Legacy fields were mapped to the S/4HANA model properly, the broken custom ABAP was rewritten, and automated ETL pipelines cleansed and deduplicated customer, material and finance master data. The Golden Record was validated against real business processes with the functional leads rather than signed off on paper, every load was reconciled to source, and cutover was rehearsed against explicit go and no-go criteria.

The work behind this result

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Frequently asked questions

Can a stalled S/4HANA migration be recovered without changing integrator?

Yes, and changing integrator usually restarts the clock. This programme was rescued from inside the existing integrator's governance, reaching a clean go-live in five months with no operational downtime.

Why does SAP data mapping fail twice on the same programme?

Because the same capability attempts it again. The integrator's data resources here were junior and stretched, so the programme needed senior data capability inserted rather than replacing. Two failed loads became one clean cutover.

What breaks custom ABAP in an S/4HANA migration?

The simplified data model. Custom code written against ECC table structures breaks against it, and this programme's ABAP was rewritten alongside proper field mapping, avoiding over $500K in projected overrun and penalty exposure.