Introduction
As we know the S/4HANA is picking the speed and many customers started evaluating the S/4HANA transition requirement.
The S/4HANA transition can be done with 3 different options as explained in the blog: S/4HANA – Path to Digital Transformation
But the main question comes is which option is good from the customer point of view and what is the option as a S/4 consultant I can give it to my customer so that they can en-cash the benefits of S/4HANA and get the optimal return what the business is looking for.
Frankly speaking there is no right or wrong answer about which option a customer should consider for S/4 transformation, however based on my limited work experience in S/4 space, I have some point of view which I learnt over the period.
Again as I mentioned earlier there is no right or wrong answer in selecting the option and it’s completely driven by business decisions.
So as we know there are 3 options for S/4 transition, as per my view the “greenfield” implementation is the more suitable and easy to adopt option for any of the customer. I have put down certain points to support my view and I welcome others to add any additional viewpoints they might have,
From the “greenfield” implementation perspective if I divide the various tasks which are required for S/4HANA implementation vs the list of tasks required to go with the system conversion option then we will find quite a huge list of activities required in order to perform the conversion of existing system as against fresh implementation.
So let’s compare both these options with certain parameters,
S/4HANA “greenfield” Implementation:
Planning
The S/4HANA “greenfield” implementation means the new implementation of SAP S/4HANA, e.g. for customers migrating a legacy system, also known as ““greenfield”” approach.
Basically for any “greenfield” HANA implementation there are certain activities which are very important and needs to be considered while doing the new implementation,
It’s very important to have robust planning done for S/4 implementation. The planning activities mainly consist of,
Basically these are the most common activities for any of the “greenfield” implementation but from the S/4HANA perspective the important aspect would be to consider the strategy around moving the data from legacy/SAP systems
Timelines
Based on the Demo 21 implementation as well as the on-premise implementation which I did the “greenfield” implementation has shorter timelines due to faster implementation cycle
The additional activity of data migration planning and strategy which is required for “greenfield” implementation and which might be little time consuming based on the below considerations,
Cost
The cost parameter is driven by lots of factors, but based on my experience I can see the new implementation cost is less as compared to system conversion due to shorter timelines and the number of resources which will be involved in implementation
Number of Steps
Earlier we saw few basic steps as part of planning activity, so mainly the high level steps which are required for “greenfield” implementation are,
Team Involvement
PMO - It’s very important to have a strong technical Project manager involved for your S/4HANA green filed implementation. The technical project manager is the one who can understand and co-ordinate very well between SAP, HW vendors, Infrastructure team, and basis team, as these are the major components in the HANA implementation projects
Infrastructure – You should have infrastructure resources from data centre setup, network, operating system etc aligned to your project
Basis – Basis team plays very important role throughout the project and they have major activity during the installation using the SWPM – software provisioning manager tool
Functional (Limited – Based on business functions which needs to be adopted)
ABAP Technical (If any custom development needs to be done on top of S/4 functionality)
Tools
Below are the main tools which are required for “greenfield” implementation,
Impact on existing Landscape
With “greenfield” implementation there is minimum impact on your existing landscape and only new S/4HANA landscape needs to be setup along with SAP data services system for data migration
Data Strategy
Robust data migration strategy is required to load the initial data. It’s very important to use the ETL tool such as SAP DS. Also, the data strategy helps in archiving the older data and load only required data into newly implemented S/4HANA system so that it will have reduced data footprint, optimal performance and good return on investment
Business Process Optimization
Simplified and easy to adopt business process due to new implementation
S/4HANA System Conversion:
Planning
The S/4HANA system conversion is good for the customers who want to convert their current system into SAP S/4 system
The initial planning activities which needs to be considered for the system conversion is similar to that of “greenfield” implementation as below,
Addition to this the major steps for system conversion starts with the analysis of your existing system, compatibility checks, custom development checks and rectification and making sure the source system is ready for conversion.
The additional activities which we are talking about here are very time consuming and needs to have proper analysis, deep thinking of various dependencies and thought process to make the conversion project successful
Timelines
Currently I am in process of doing the system conversion for one of our ERP system. Based on the process the system conversion timelines is very long due to various activities which are involved for system conversion,
Cost
More cost as compared to “greenfield” implementation as longer timelines to implement and many teams are involved
Sometimes the source system is not compatible and pre-requisites are not mate for S/4HANA conversion. So to make your source system compatible you need to perform various activities which adds up the cost to overall system conversion project
Number of Steps
For the system conversion scenarios the requirement is to have all the steps which are mentioned for “greenfield” and additionally the steps which are required from the initial system readiness from business functions as well as custom code adjustment perspective
Please refer the below blog series to get an idea about different S/4HANA system conversion processes,
S/4HANA – Path to Digital Transformation
Team Involvement
For the system conversion scenarios, it’s very important to have technical project manager along with the functional leads from the respective business functions which are enabled in your source systems.
The functional consultant’s needs to analyse and make sure the business functions are validated against the existing processes to make your conversion successful
Additionally, it’s very important to involve the strong ABAP technical resource who will be able to analyse the custom code against the simplification list of S/4HANA
Tools
Tools required are,
Impact on existing Landscape
For the system conversion projects, it’s always recommended to have n+1 landscape. So additional landscape planning is required, the parallel landscape helps to avoid business disruptions
Additionally the requirement is to have NW7.5 ABAP stack to do the custom code analysis, this is temporary server requirement
Data Strategy
For system conversion it’s very important to complete the analysis required to migrate the data before we start the conversion activities
It’s recommended to put together the strategy to get rid of unwanted data, have archiving strategy in place to reduce the data footprint on S/4HANA. It helps to make sure there is no data loss during migration process and the migration activities are faster
Business Process Optimization
Even though SAP claims system conversion as Migration without re-implementation, still as part of conversion process, functional team will end up doing the review the existing business process as those needs to be map with the S/4HANA business processes as you need to re-evaluate the existing process flows.
Conclusion:
So based on the above data points what we can conclude is the “greenfield” option is very viable for the customers,
Whereas system conversion is viable option for the customers,
Recommendations
So finally, as we stated earlier there is no right or wrong answer for the option and it’s very much driven by the business requirements. However the recommendation is to opt for the “greenfield” implementation due to below upfront benefits,
Lastly I want to put a quote from one of the famous businessman “I don’t believe in taking right decisions, I believe in taking decisions and making them right”.
So whatever path you choose for your S/4HANA transitions just take the decision and make it right with right procedure.
Hope this blog helps you with your S/4HANA transition, good luck!
Reference Links
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