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I took over the maintenance of this blog from Frank Wagner, which shifted his focus from S/4HANA System Conversion to SAP S/4HANA Public Cloud Business Configuration.

This blog is a follow-on to Frank Wagner’s S/4 SCN Blog (“System Conversion – Technical – Semantical”:, which was not available some weeks (now the archived version is accessible again). As it is not possible to make updates or comments to the old blog any longer, please use this Blog for your reference.

Like the initial blog – this blog gives a short overview about the SAP S/4HANA transition scenario “System Conversion”. At the end there are related Information which are recommended to be read.

At the moment this blog refers to S/4HANA releases 1511 FSP02, 1610 initial shipment, 1610 FSP01, 1610 FSP02 and 1709 initial shipment.

Kind regards,


SAP S/4HANA System Conversion

The SAP S/4HANA is one of the transition scenarios to move to SAP S/4HANA. The following figures displays the three transition scenarios:


  • System Conversion: It is a complete technical in-place conversion of an existing SAP Business Suite ERP system to SAP S/4HANA. This is the preferred option for Customers which want to bring their business processes to the new platform and want to adopt new innovations at their speed, then.
  • New Implementation: New installation of SAP S/4HANA e.g. for customers migrating a legacy system or a highly customized SAP System. This is the preferred option for customers which want to put their focus on reengineering and process simplification based on latest innovations. They can implement innovative business processes with best-practice content on a new platform, perform an initial data load from their old system and then retire their old landscape
  • Landscape Transformation: It is a value driven data migration to the new platform, e.g. consolidation of current SAP Business Suite landscape into one global SAP S/4HANA system or selective data migration based on legal entities.

The SAP S/4HANA System Conversion is the scenario to be chosen if a customer wants to change their current SAP ERP system into a SAP S/4HANA system. Based on the offered tooling technical the SAP S/4HANA software is installed, the database is migrated to SAP HANA database (if not already done) and transfers data from old data structure into new S/4HANA data structure (e.g. migrate data into the new MATDOC table) in one-step.

Things are different in SAP S/4HANA

Even if a technical approach to convert an existing system to SAP S/4HANA the customer need to be aware that things are different compared to SAP ERP. As part of the application innovation data structure has been adapted to leverage the capabilities of the SAP HANA database. In SAP S/4HANA we are following the principle of one more consequently.

To enable our customers to better plan and estimate their path to SAP S/4HANA, we have provide different tools and we created the “Simplification List for SAP S/4HANA”. In this Simplification List we describe in detail, on a functional level, what happens to individual transactions and solution capabilities in SAP S/4HANA.

The following figure displays the system conversion sequence at a glance:

The sequence and the related tooling is described in the SAP S/4HNA Conversion Guide

For more information see Conversion Guide for SAP S/4HANA within the SAP Help.

Current Links:

  • SAP Help S/4HANA: LINK
  • Current Version of the SAP S/4HANA Conversion Guide: PDF


System Requirements – the System Conversion Paths

The following figure display at a glance how a customer can move to SAP S/4HANA within the “System Conversion” Transition Scenario in a so called “One-step-Procedure”.

System Conversion paths basically:

  • From SAP Business Suite (ERP6.0, EHP xx, AnyDB or SAP HANA DB)  to SAP S/4HANA
  • From SAP Business Suite (ERP6.0, EHP xx, AnyDB or SAP HANA DB)  to SAP S/4HANA Finance
  • From SAP S/4HANA Finance to SAP S/4HANA

One Step-procedure to SAP S/4HANA On-Premise Edition product family supported for SAP ERP 6.0 EHPxx systems (Unicode Only and AS ABAP-only system [no AS ABAP / AS Java dual-stack system])

Note: The figure (at the point where the figure was created) contains as well SAP S/4HANA releases which are planned to be available in future. This cannot be considered as binding information, it displays more the logic of the transition paths.

Some Remarks (some questions which often come up in customer meetings):

  • The transition to SAP S/4HANA does not require the source system to be already on SAP HANA DB
  • SAP S/4HANA Finance was the first offering under the SAP S/4HANA product family. The decision to go for SAP S/4HANA Finance should be based on the business benefits, but is not a mandatory prerequisite for any system conversion. A customer can move from SAP ERP6.0 (any EHP) to SAP S/4HANA Enterprise Management directly in one-step.
  • For older SAP Business Suite releases or systems on Non-Unicode an additional step to SAP ERP 6.0 EHPxx is required.

Simplification List for SAP S/4HANA

To allow our customers a better planning and estimation of their way to SAP S/4HANA, we have created the “Simplification List for SAP S/4HANA”. In this list we are describing in detail on a functional level what happens in S/4HANA to individual transactions and solution capabilities. In some cases, we have merged certain functionality with other elements or reflected it within a new solution / architecture compared to the SAP Business Suite products.

For more information see Simplification List for SAP S/4HANA within the SAP Help.

Current Links:

  • SAP Help S/4HANA: LINK
  • Current Version of the SAP S/4HANA Simplification List: PDF

Maintenance Planner

The Maintenance Planner is a sSolution hosted in SAP Support Portal at:

It simplifies landscape maintenance process to update, upgrade and install systems with ease and efficiency by checking the system with regards to business functions, industry solutions, and add-ons. If there is no valid path for the conversion (for example, the add-on is not released yet), the Maintenance Planner prevents the conversion. The Maintenance Planner is a pre-requisite for the system conversion to SAP S/4HANA. The Maintenance Optimizer (MOPZ) is not used.

ŸEntry via the ‘Plan for SAP S/4HANA’ entry tile:

  • Offered to ease transition to new product line
  • Automatically integrates all building blocks (such as SAP Fiori)

The procedure to follow is:Ÿ

  1. Define changes (based on your landscape data in customer profile)
  2. ŸSelect files (like you did in Maintenance Optimizer)
  3. ŸPush all required tools, archives and stack.xml to your download basket

For more information regarding Maintenance Planner see:

SCN BLOG: Maintenance Planner

SCN BLOG: Maintenance Planner – Release Highlights



Pre-checks are shipped as SAP Notes to customers that want to convert to SAP S/4HANA. Customers can use these pre-checks to find out what mandatory steps they have to carry out before converting to S/4HANA.

The Pre-checks are executed on the (SAP Business Suite) start system (preparation phase) to determine relevant Simplification Items. The results list the Simplification Items that need addressing before attempting the conversion process.

Pre-Checks are executed again as step in the Software Update Manager (SUM). In case dedicated Simplification Items require mandatory preparation steps the conversion procedure can stop to ensure a consistent system conversion. The conversion is stopped if errors persist.

Implement SAP Note 2182725, and all the related notes attached to it. Make sure to use latest version of this note and regularly check for updates of all attached notes. Implement and run these reports on every system in your system landscape (sandbox, development, quality assurance, productive) that you want to convert to S/4HANA

For more details see the following dedicated Pre-Check Blog: Link

Outlook: With the S/4HANA release 1709 a new, improved pre-check framework will be available:

Custom Code Checks

These checks are based on the Simplification list concept. Before converting to SAP S/4HANA you need to check your custom code against the SAP S/4HANA simplifications. These simplifications are loaded into the Custom Code Check Tool. After you run the tool, you obtain a list of instances where your custom code does not comply with the scope and data structure of SAP S/4HANA 1511, on-premise edition

Motivation & Categories of Custom Code Adaption

1. Housekeeping tasks

(can be done before / independently of a SAP S/4HANA conversion)


•       Get transparency about existing Custom Code. Remove waste and obsolete custom code. Go back to standard, remove modifications

•       Apply custom code best practices which were valid even before SAP S/4HANA. Example: use SAP domains instead of own Z domains copied from SAP domains

•       Supported based on   Custom Code Lifecycle Management Tool-Set (CCLM) and Procedure Logging (UPL)

ABAP Development Community: Link

Usage Procedure Logging (UPL): Link

Best Practises Custom Code Lifecycle Management (CCLM): Link


2. SAP HANA database related

(can be mostly done before / independently of a SAP S/4HANA conversion)


•       Apply SQL “golden rules”. Example: it’s bad practice to assume that a DB returns results sorted if not explicitly requested (ORDER BY).

•       Performance optimizations (optional)

ABAP custom code migration and recommendations for SAP HANA:

•       SAP Note: 1912445

•       SAP SCN: Link


3. SAP S/4HANA related

(can be partly done before / independently of a SAP S/4HANA conversion)


•       Adapt custom code which does not comply to simplified SAP S/4HANA data model and scope. E.g.:

–        New aggregate and indices-free material inventory table MATDOC in SAP S/4HANA

Further information see:

SCN Blog on Custom Code Adaption

SAP Note: 2241080

SAP Note: 2190420



For more information about the Custom Code Check tool, see SAP Help Portal: Link


Software Update Manager

Software Update Manager (SUM) is the technical tool for system conversion to SAP S/4HANA.


  • You must run the Maintenance Planner before the SUM.
  • Ensure that the latest version of the Software Update Manager is used:
  • For all information about using the SUM, please see the document Conversion of SAP Systems to SAP S/4HANA using Software Update Manager available at:  in section System Maintenance

Basically spoken there are three steps which are executed within the Software Update Manager in one step:

  • Software Update
    Update of your system with the S/4HANA software
  • Database Migration
    If it is required to migrate the database to SAP HANA database the so called Database Migration Option) DMO of SUM.
  • Data Conversion
    Conversion of data from the old data structure to new S/4HANA data structure

New SAP Readiness Check

The Readiness Check has been a part of the available SAP S/4HANA Value Assurance Service Packages helps you to analyses your system with regards to the SAP S/4HANA System Conversion. For more information regarding the corresponding SAP Service offering see

By end of may 2017 a new self-service SAP Readiness Check has been released, which customers can run themselves within their SAP Solution Manager infrastructure:

  • ŸThis holistic system analysis can be used as the foundation for further planning steps toward a successful and smooth SAP S/4HANA system transition.
  • ŸThe SAP Readiness Check for SAP S/4HANA summarizes the most important aspects of the conversion in an easily consumable way.

For more information about the SAP Readiness Check, see SAP Help Portal: Link

Here you will find the User Guide and the link to SAP Note 2290622, which describes the setup of the SAP Readiness Check for S/4HANA.



Frequently Asked Questions

Find in the following SCN Blog questions which might come up to you related to the SAP S/4HANA System Conversion. Link
They are taken from the general S4 FAQ where you find the link here.


Related Links

General Information

SAP S/4HANA 1511


SAP S/4HANA 1610

Initial shipment

SAP S/4HANA 1610


SAP S/4HANA 1610


SAP S/4HANA 1709

Initial shipment

SAP S/4HANA On-Premise documentation

(select the appropriate

release dependent information)

Getting Started With SAP S/4HANA PDF PDF PDF  PDF PDF
Conversion Guide for SAP S/4HANA PDF PDF PDF  PDF PDF
Simplification Item Catalog URL
Simplification List for SAP S/4HANA (S/4HANA SCN) Link n/a
Simplification List for SAP S/4HANA PDF PDF PDF  PDF PDF
Simplification List for SAP S/4HANA(as XLS) 2313884
SAP S/4HANA Cookbook Link
SAP S/4HANA Feature Scope Description PDF PDF PDF  PDF PDF
SAP S/4HANA Release Information Note 2189824 2346431 2482453
SAP Fiori for S/4HANA Release Information Note 2214245 2356208 2482461
SAP S/4HANA Finance 1605: Release Information Note 2233539
SAP S/4HANA Restriction Note 2214213 2333141 2491467
SAP S/4HANA supported industry solutions (see restriction note) 2214213 2333141
SAP S/4HANA Country Versions: Release Information & Restriction Note 2228890 2349004
SAP S/4HANA Compatibility Packages 2269324
Blacklist Monitor in SAP S/4HANA on premise 2249880
Process integration with other SAP on-premise systems 2241931 2376061
System Conversion Paths(S/4HANA SCN)

Link  or see attachment to SUM note 2277083


SAP S/4HANA sizing report 1872170
Unicode Conversion Overview Guide(S/4HANA SCN) Link
SAP S/4HANA @SAP Learning Hub Link
S/4HANA Trial Link
SAP Best Practices for SAP S/4HANA, on-premise edition Link
SAP Activate Link
FIORI App Library Link
Elements for Designing a Transition Roadmap to SAP S/4HANA Link
Solution and Product Road Maps Link




Information in Conversion Sequence Steps

Maintenance Planner

SAP S/4HANA 1511
SAP S/4HANA 1610
(initial shipment)
Maintenance Planner (SAP Help) Link
Maintenance Planner – SCN Blog Link or Link
SAP S/4HANA and Business Functions(S/4HANA SCN) Link
SAP S/4HANA: ALWAYS_OFF Business Functions 2240359
SAP S/4HANA: ALWAYS_ON Business Functions 2240360
SAP S/4HANA Compatible Add-ons  2214409
SAP S/4HANA Compatible partner products 2244450 2392527
Add-on Product Versions released on SAP NETWEAVER 7.5 2156130 tbd
Uninstalling ABAP add-ons 2011192
Conversions to SAP S/4HANA On-Premise with 3rd Party / non-SAP Add-ons 2308014


Pre-Check related information

SAP S/4HANA 1511 (FPS2) SAP S/4HANA 1610 (initial shipment) SAP S/4HANA 1709 (initial shipment)
Delivery of the S/4H System Conversion Pre-Checks 2182725
Pre-Checks related to FIN 2332030 and 2333236 and 1939592
S/4SCN Blog regarding Pre-Checks Link
Application specific notes in preparation phase n.a. 2389794 2495992


Custom Code

SAP S/4HANA 1511
SAP S/4HANA 1610
(initial shipment)
Custom Code Migration

SAP Help Portal:

–> SAP NetWeaver for SAP S/4HANA
–>   FunctionOrientedView
–>  Application Server
–>  Application Server ABAP
–> Application Development on AS ABAP
–> Customer-specific ABAP Development
–>   Custom Code Migration

Custom code check content for SAP S/4HANA 2241080
Running Custom Code Analyser and Downloading ZIP File(s) 2185390
SAP SCN – SAP S/4HANA Custom Code Migration Worklist Link
Custom Code within SAP S/4HANA On-Premise Link


Software Update Manager (SUM)

SAP S/4HANA 1511
SAP S/4HANA 1610
(initial shipment)
Software Update Manager (SUM)
Software Logistics Toolset –> System Maintenance
Add. info. on converting to SAP S/4HANA using SUM 1.0 SP 20
Software Update Manager (SUM)  – SCN Blog with more information Link
DMO Database Migration Option – SCN Blog with more information Link


Follow-On Activities


SAP S/4HANA 1511 (FPS2) SAP S/4HANA 1610 (initial shipment) SAP S/4HANA 1709 (initial shipment)
Follow-On activities related to FIN 2332030
 Application specific notes in Follow-On Phase n.a. 2389807 2495932





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  1. Frank Wagner


    I would like to put your attanetion to the following PPt from Outbound Product Management related to the S/4HANA 1610 Transition Scenarios: PPT

    Kind Regards,

  2. Ignacio Kristof

    Hi Frank, as usual your posts are great and really helpful for the ones  working with /learning S/4HANA.

    With 1503 and 1511, it was easy for me to build an implementation plan as both conversion guides were listing the steps to be performed. 1610 is a more complex document as it points to many OSS notes and makes difficult to build a step by step plan. The questions that maybe you can provide some overall guidance are:

    1.Is 1511 Conversion plan a good starting point to build a 1610 plan, or the conversion process has suffered substantial changes?

    2.I see that in the figure above, data conversion is under SUM. Has this changed and migration of balances and line items happen within SUM? I could not get that clearly from the documentation.

    Thank you.


    1. Frank Wagner

      Hello Ignacio,
      (if you have proposals to make things more clear let me know – I still have issuse with new SCN approach to maintain my pages properly).

      1. Regarding the System Conversion the system conversion sequence (the plan how you call it) did basically not change from 1511.

      • The main official document to describe that is the 1610 Conversion Guide
      • The baisc sequence is: Maintenance Planner, Pre-Checks, Custom Code Checks then SUM. Additionally we  have made a bit more transparent in 1610 how the FIN specific steps fit into this sequence. For example the chapter about the accouting pre-checks.

      2.  The activities related to FIN are basically unchanged compared to 1511 aswell in 1610. SAP Note 2332030  and the PDF linked there should describe the FIN steps

      If you could specify what you think is unclear/not transparent enough in the 1610 docu let me know. I can try to explain – In any case it would be a helpful input to make things better.

      Kind Regards,

      1. Ignacio Kristof

        Hi Frank, thank you for responding. Just to be clear, your posts are always very easy to understand. I was referring to the official Conversion Guide for 1610. The points not easy to understand for me were:

        1.I could not easily identify if there were important changes from 1511 conversion to 1610 or if the steps were almost the same.

        2.Also, the Conv. Guide points to note 2332030 that leads you  to an attachment, that also does not give a list of steps but points to IMG section “Migration to S/4HANA Finance”. I preferred the way that 1511 Conv. Guide was built, that had a list of steps per section.

        A couple of colleagues shared that they had some difficulties too. With your response and after reading it a couple of more times, I am more comfortable now.

        Thank you for taking the time to respond messages and being open to suggestions. Your posts are great help for us.

        Best regards.

    1. Frank Wagner

      Hello Amit,

      the “Readiness check” is a SAP service offering as part of the SAP Value Assurance Service Packages (
      The Pre-Checks are a step in the S/4HANA System conversion sequence. The Pre-Check do:
      (a) identify the relevance of a Simplificaition Item (it is planned to increase the coverage of Pre-checks in the near future)
      (b) ensure that tasks which need to be executed before S4 conversion are triggered. In case these tasks are not executed the conversion procedure will stop in SUM (application example: The actvation of the Customer / Vendor integration – the Business Partner Approach)

      Within the Readiness Check as servcie offering the servcice colleagues are supporting the customer with the task to identify those tasks which need to be triggered as part of the S4 system conversion. As part of this readiness check service offering the colleagues are triggering the Pre-Checks as one step. Another step which is triggered in the readiness check is the csutom code analysis. In this sense the offered standard tooling (like the pre-checks or the custom code check) is used by our service colleagues.

      I hope that explains the difference.

      Kind Regards,

  3. Ignacio Kristof

    Hi Frank, I am reaching you again to see if you could share some light on a topic that I am not clear: Archived data.

    • At the moment of data migration during a System Conversion, what FI data will be migrated by Conversion jobs?
      • I would say Open and Closed non archived items.


    • If above assumption is correct, what happens when you retrieve archived data after converting to an S/4HANA system?
      • For example, I want to display ACDOCA line items, including archived periods.Will the system convert it to the new data structure “on the fly”?

    Any information that you can give or article you recommend to read, would be helpful.

    Thank you!!  as usual




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