Data Migration ECC WM to S/4 embedded EWM

[abeilharz]

Hi community,

we're currently in the conversion process from ECC WM to S/4 embedded EWM. Are there any specific instructions, training documents, reports or best practices regarding the data migration from wm to embedded EWM?
Like e.g. are the tables MLGN and MLGT mandatory to be migrated? Or not, because in the embedded scenario EWM is using the data directly from ERP (S4).

Many thanks in advance.

BR Andreas

[JuergenPitz]

Hi,

there are migration tools (as described by Andreas Mergler). The tools are originally build to migrate an ECC WM to a SCM based external EWM - so there are some settings which are confusing eventually (but of course that make them work decentral as well).

But the main thing is: let's just say that the tools could be better? Now this is not necessarily a problem caused by the tools. But the problem is that although several aspects of WM and EWM are similar, in details there are sometimes really huge differences. For example in WM you have the interim storage types, which creates the connection between IM and WM. The storage types with the role "staging area group" in EWM are the same from the basic idea - but still they work very differently. The determination and the actual role is not the same as in WM. And there the tools have some weird hardcoded settings.

So if you are not very selective, you migrate a lot of things (like storage type 999), which do not make any sense. The same is true for WM movement types vs. warehouse process types.

My personal opinion is to set up the EWM new. Yes, that might to be more work - but using the migration tools is something which also requires a full project and a lot of work afterwards - and you work with a lot of limitations you bring over from WM.

We used to offer a course for the migration tools - but sincerely, after the option of continuing WM in a reduced from as Stock Room Management, for me this is dead and we stopped offering this.

It also sounds as if you have not really made yourself familiar with EWM? Are you sure you want to change from WM to EWM at all?

Brgds

Juergen

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All the above is no official SAP statement.

Want to learn EWM?

Check for EWM courses: https://training.sap.com/trainingpath/Applications-Extended+Warehouse+Management-EWM+in+S4HANA

Get a SAP Learning Hub Subscription: https://training.sap.com/learninghub

And it is EWM. NOT eWM - Duh!

And if your question includes the word "transfer order" - do NOT tag the question with Extended Warehouse Management!

[Andreas_Mergler]

Hi Andreas,

check SPRO in EWM and go to "Interfaces --> Migration from LE-WM".

There are some tools to help convert WM-customizing to EWM-customizing. None of the tools are mandatory - eventually EWM works completely different from WM.

I cannot tell you how well the tools work and how useful they are as we have always build EWM "from scratch" (using warehouse number 0001 or BC-sets).

With regards to Embedded EWM "using" S/4 data: that is master data and process document data, but not customizing of the warehouse.

In addition here is a link with more info: https://d.dam.sap.com/a/NcaxC32/005_Migr_WM_EWM.pdf?rc=10

Not sure whether that will work, if not go to SAP Community https://community.sap.com/topics/extended-warehouse-management and look for "How-to-guides" - you should find a document called "Migration of SAP ERP WM to SAP EWM".

Hope that helps, Andreas

[DominikTylczyn]

Hello abeilharz

In addition to 56461ebe76024ff482c5fe46aa8c6390 answer, I'd suggest SAP Help page Migration from LE-WM and blogs:

• Migrating from SAP WM to Embedded EWM in SAP S/4HANA
• Migration from SAP WM to S/4HANA EWM

As per SAP Help Warehouse Product Migration:

This function reads the corresponding material data from SAP S/4HANA using a remote function call (RFC) connection. The data sources in SAP S/4HANA are the following tables:

• MLGN - Material Data for Each Warehouse Number
• MLGT - Material Data for Each Storage Type
• MARA – General Material Data (optional)
• MARC – Plant Data for Material (optional)

Best regards

Dominik Tylczynski