Step-by-step migration from SAP ECC to S/4HANA

The discontinuation of SAP ECC in 2027 in favor of the new S/4HANA solution is a major milestone, especially since transitioning from the older generation of ERP requires a methodical approach if you want to minimize disruption and ensure a successful migration.

Step by step : the steps to follow for a successful transition from SAP ECC to S/4HANA

We will walk you through the migration steps to follow, step by step, from the initial assessment to implementation and through to the final Go Live. We will also share tips for planning a migration without service interruption, in order to maintain continuity in your day-to-day business operations.

Step 1. Assessment and planning : define your objectives and strategy

The assessment and planning stage is essential for laying the groundwork for a smooth migration. It involves an in-depth analysis of your current SAP ECC environment, your business needs, and your objectives at the end of the migration project.

  • Assess your current SAP ECC environment : identify the SAP modules you use, the customizations made over the years by reassessing them to determine whether they are still appropriate, and measure the volumes of data to be migrated.
  • Define your migration objectives : identify the new SAP S/4HANA features you want to implement and the expected benefits for your teams.
  • Choose a migration strategy : select the most suitable path among the Greenfield approach (complete new installation), Brownfield approach (conversion of your existing ECC system), or Bluefield approach (a hybrid approach combining the two).
  • Develop a detailed project plan : define the different phases of the migration, the required resources, the precise timeline, and the budgets associated with each stage of the project.

Step 2. Preparing the groundwork for migration

The target system preparation phase involves setting up the SAP S/4HANA environment and preparing the data and programs for migration from SAP ECC.

  • Install and configure SAP S/4HANA : provision the cloud environment of your choice between the RISE with SAP and GRW with SAP offerings to host the new ERP system.
  • Migrate the data : extract, clean, and load the data from your ECC system into SAP S/4HANA while taking into account the necessary transformations due to the new data model compared with SAP ECC.
  • Convert programs and customizations : adapt your custom code in ECC to S/4HANA requirements using the appropriate SAP tools.
  • Test and validate the solution : perform comprehensive pre-production testing to ensure that the migrated system works correctly and meets your expectations in terms of functionality and performance.

Step 3. Implementing and deploying SAP S/4HANA

The implementation and deployment phase marks the actual transition from your SAP ECC system to S/4HANA. It involves user training, switching over to the new system, and monitoring after Go Live.

  • Prepare users : train your users on the new features by introducing them early on to the differences between SAP S/4HANA and SAP ECC to ensure smooth adoption of the new system.
  • Go-live : switch from the SAP ECC system to S/4HANA while minimizing disruption to your ongoing operations, with a backup system ready as a fallback.
  • Post-migration monitoring and support : continuously monitor the performance of the S/4HANA system, provide user support, and apply the necessary fixes to ensure the system runs properly.

Achieving a migration without service interruption

Planning a migration without service interruption minimizes the impact on your daily operations and ensures business continuity. This involves implementing a switchover strategy with a backup system ready to take over in the event of a problem during the migration. You will also need to inform users, partners, and customers about the migration, its timeline, and its implications. Finally, you will need to manage organizational changes and adapt business processes and roles based on the new features and new user experience of SAP S/4HANA.

The migration from SAP ECC to S/4HANA therefore represents much more than a simple upgrade. It is a major transformation that gives your company the opportunity to adopt a modern, high-performance, and innovative ERP platform.