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Essential Guide to SAP S4HANA Conversion Readiness Check for Beginners

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What is the Check for Readiness?

Before moving to SAP S/4HANA, the Readiness Check is SAP’s way of checking the health, structure, and readiness of your current SAP ERP system (usually ECC). Think of it as a full pre-conversion audit that shows you what has to be fixed, upgraded, or changed.

Why Readiness check important?

Switching to S/4HANA is more than simply a tech upgrade; it changes how your business runs. The Readiness Check identifies conversion bottlenecks early to reduce risks.

This process aids in the planning of when and how to allocate resources.
Tells you vital things regarding custom code, business functions, and add-ons.
Saves money by avoiding any surprises during the conversion process

A Technical Kickstart for a Seamless Transition

The readiness check is a crucial step for those new to SAP, providing a comprehensive assessment of their current SAP system (ECC) before upgrading to the next-gen S/4HANA. This strategic diagnostic tool offers a health check-up, providing a comprehensive assessment of the system’s readiness for conversion. A detailed guide with technical insights is provided to help embark on this journey.

Step-by-Step Breakdown

The Readiness Check for S/4HANA is a tool that helps identify and address necessary changes in your current system, including custom code and large amounts of data. It helps determine the labor required for the change and provides a roadmap for accomplishing tasks with confidence, utilizing a set of tools to assist in the process.

Install SAP Notes 2758146 and 2399707 to enable readiness tools, collect system data using reports, and upload ZIP files to the SAP Readiness Check portal for analysis, providing insights on simplification items, custom code impact, data volume, business process usage, and integration.

1. Implement Essential SAP Notes

Make sure that the following SAP Notes are set up in your ECC system before you continue

2758146 – Readiness Check for S/4HANA & Process Discovery
2399707 – Simplification Item Relevance Check
2185390 – Custom Code Analysis (SYCM)
2781766 – Custom Code Analyzer (ATC)
1872170 – S/4HANA Sizing
3010669 – Customer Vendor Integration (CVI)
2612179 – DVM API for ST14 Analysis

Note: Always de-implement older versions before applying new ones.

2. Collect System Data

Utilize the following transactions and reports to gather essential system data:

SE38 → RC_COLLECT_ANALYSIS_DATA: Collects system usage and configuration data.
SE38 → SYCM_DOWNLOAD_REPOSITORY_INFO: Exports custom code repository info for analysis.
SE80 → Create Function Group CVI_READINESS_CHECK: Required for CVI analysis.

3. Upload to SAP Readiness Portal

Visit the SAP Readiness Portal and upload the following files:

RC2AnalysisDataSIDyyyymmdd.zip
S4HMigrationRepositoryInfoSID.zip

This will generate a detailed dashboard encompassing:

Simplification Items
Custom Code Impact
Data Volume Management
Business Process Usage
Integration Readiness
Sizing Recommendations

4. Analyze Key Outputs

Simplification Items: Identify mandatory changes (e.g., FI-GL, Asset Accounting).
Custom Code: Use ATC to flag obsolete or incompatible code.
Sizing: Based on real usage, not just hardware specs.
CVI: Ensure Business Partner conversion readiness.
DVM: Clean up unused data to reduce migration load.

Example Scenario

Consider a customer with ECC on Oracle DB who runs the Readiness Check and discovers the following:

200+ custom objects need remediation
15 simplification items in Finance and Logistics
3TB of data, with 40% being archivable
CVI not yet implemented

This insight allows them to prioritize cleanup, testing, and training before commencing the SUM-based technical conversion.

Final Thoughts

The Readiness Check is essential, serving as your conversion compass and helping beginners identify key activities. They should de-implement old SAP Notes, use SE38 reports for report generation and run Custom Code Analyser to clean up code before beginning integration issues such as Customer-Vendor Integration.

Top Tips for Newbies Learn to simplify things. They impact how companies operate as much as the technology. Engage business partners early – being ready isn’t solely IT’s responsibility!
Write down every change; some will require modification or alteration. Create workshops where you can discuss what has been learned through using this tool, then collaborate to determine the next steps together. Did any insight surface?

There are systems that will detect hundreds of simplification items that need fixing; don’t worry; each item comes equipped with SAP instructions, suggestions and recommendations for correcting its issue.

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