10 Steps for Migrating to SAP EWM on SAP S/4HANA P...

Amar_Kumar · ‎06-18-2020

With the release of decentral SAP EWM on SAP S/4HANA Platform, the migration to SAP EWM on SAP S/4HANA has become a top priority for existing SAP EWM customers. However, the move to SAP EWM on SAP S/4HANA can be quite challenging as unlike an upgrade this will be a greenfield migration. The two main challenges are:

Migration of custom code

Handling of documents which cannot be closed during the cutover to SAP S/4HANA (transactional documents cannot be migrated due to changed GUIDs for products and business partners)

In this blog post, I will address the 1st challenge and provide 10 steps for setting up the SAP S/4HANA decentral EWM system based on the legacy SAP EWM system.

Setting up the SAP S/4HANA decentral EWM system

Setup of SAP S/4HANA system for decentral SAP EWM deployment (Note 2840129 contains a How-to-guide)
1. RFC Connection to SAP ERP and Legacy SAP EWM systems
2. Setup ALE distribution model from SAP ERP to SAP S/4HANA decentral EWM System as described in the setup guide

Migration of custom code and custom DDIC objects
1. Transport/Import Custom code from legacy SAP EWM system (ABAP Transport)
2. Run ATC checks for SAP HANA readiness
3. Resolve conflicts due to changed Standard Routines
4. Adapt code which uses obsolete or no more supported functionalities (see below EWM Simplification List)

Migration of common customizing from SAP ERP System
1. Currencies, Units of Measure, Countries, Regions, Factory Calendar, etc.
2. Material Master related customizing like Material Types etc.
3. Number ranges for Business Partners, Customers and Vendors (these should be as external in SAP S/4HANA EWM System)
4. Incoterms, Shipping Conditions, HU types etc. (see below EWM Simplification List)

Migration of customizing from legacy SAP EWM System
1. Cross Warehouse customizing settings (SCM Basis)
2. Warehouse specific settings (Extended Warehouse Management)

Initial Data Transfer of Master Data from SAP ERP to SAP S/4HANA EWM System
1. Material
2. Batches
3. Customers
4. Vendors
5. Quality Inspection Rules
6. HAZMAT Master Data

Migrate SCM Routes, Packaging Specifications from Legacy SAP EWM System (Distribution Model)

Migrate warehouse specific master data from Legacy SAP EWM System
1. SCU
2. Bins, Bin Sorting & Fixed Bin Assignments (SAP provides content in Data Migration Cockpit)
3. Warehouse Products (SAP provides content in Data Migration Cockpit)
4. QIE Setup, QIE Inspection Rules
5. Production Integration, Production Control Cycles
6. Resources
7. Work Center Settings
8. Physical Inventory
9. MFS Settings
10. Shipping & Receiving Settings
11. Wave Templates and Condition for determination
12. PPF Actions Scheduling Conditions
13. Assign User to Exception Code Profile (/SCWM/EXCUSERID)
14. Assignments: Warehouse Numbers/ business Partners (/SCWM/LGNP)
15. Assign Warehouse Number / Party Authorized to Custom ID (/SCWM/GTS_MAPWH)
16. Maintain Goods Movement bin Determination (/SCWM/GMBIN_DET)
17. Determine Algorithm Profiles for Cartonization Planning (/SCWM/CAPPDET)
18. Assign Packaging Materials to Products
19. Specify Packaging Materials for Collective HUs (/SCWM/PMATCOHU)
20. Set Up Control Parameters for Warehouse Order Creation (/SCWM/WOLOG)
21. Warehouse Billing: Settings for SNAPSHOTS (/SCWM/WB_SNAP_SET)

Migrate Warehouse independent settings
1. Configure Log for SAP ERP Messages ( /SCWM/ERPLOG)
2. Set Default Owner of Transportation Units and Vehicles (/SCWM/MTR_DO)
3. Link Between Packaging Material (TU) and Means of Transport (/SCWM/PM_MTR)
4. Set Up Printer and Form Determination (/SCWM/SR_PRINT)

Migrate Printer settings, Users and User Parameters

Migrate custom Z-Tables (non transactional data only)

EWM Simplification List (Refactoring Needed)

Sub Area	Topic	Change Type	Long Description
Master Data	Business Partners	Interface	The following BAdIs must be replaced by equivalent IDOC processing: 1. /SAPAPO/CIF_BSG_BP 2. /SAPAPO/CIF_ENHANCE_BP 3./SAPAPO/CIF_ENHANCE_ERRHDL 4.SMOD_APOCF038
		DB design	The DB table BUT0ID (additional identifiers) is NOT used in SAP S/4HANA stack. In EWM on N/W stack IDTYPE CRM010 etc. were used for storing external keys of customer/vendor etc. In SAP S/4HANA stack the CVI link tables assign a system internal customer/vendor to BP. Optionally there can be an UKMS data of assignment of external KUNNR/LIFNR of remote SAP ERP system (UKMS only available if BP is distributed with DRF and not using IDOCs DEBMAS/CREMAS, see latest version of integration guide forSAP S/4HANA 1909 decentral EWM) Any custom code using the old CRM010 BUT0ID logic will no more work.
		DB design	Entitled BP assignment to a plant in EWM on N/W stack is done with DB BUT0ID IDTYPE 'CRM011'. Because DB table BUT0ID is no more used in SAP S/4HANA stack, a new dedicated DB table /SCWM/TMAPPLANT is used (Application View /SCWM/VTMAPPLANT). Note: The entries are not transportable but shown in the IMG tree and not in the SAP reference menu tree) to assign an Entitled to a plant. Any custom code using the old CRM011 BUT0ID logic will no more work.
	Products	Interface	The following BAdIs must be replaced by equivalent IDOC processing: 1. /SAPAPO/DM_MATLOC 2. SMOD_APOCF005 3. /SAPAPO/CIF_ENHANCE_ERRHDLNote: Automatic Activation of Product Warehouse view using the BADI SMOD_APOCF005 is no longer possible. (mass creation possible in Warehouse Monitor: Product Master Data à Warehouse Attributes)
	Products	DB design	The following DB tables are replaced by standard Material Master DB tables like MARA, MARC, MARD, MARM, etc. (any custom extensions made need to be adapted accordingly): 1. /SAPAPO/MATEXEC 2. /SAPAPO/MATLOC 3. /SAPAPO/MATPACK 4. /SAPAPO/MATGROUP 5. /SAPAPO/MATTXT All the above Product master data tables and the /SAPAPO/MATKEY are only read-only in SAP S/4HANA. Any custom code making an insert or update on the above tables will cause a dump. (CDS redirect proxy to MARA etc. are in place in SAP S/4HANA for the above DB tables). Changes made to below DB tables have no impact: 1. /SAPAPO/MATLWH 2. /SAPAPO/MATLWHST
	Batches	Interface	The following BADIs must be replaced by equivalent IDOC processing: 1. /SAPAPO/CIF_ENHANCE_BATCH 2. /SAPAPO/CIF_ENHANCE_ERRHDL
		DB design	The custom extensions made to DB table /SAPAPO/VERSKEY for storing custom data, needs to be remapped to MCHA and MCHB tables.
		Functional restriction	The DB table to control local creation of batches i.e. /SCWM/TBATCHUPD does not exist anymore. Any custom code accessing these DB tables must be also adjusted. Note: The creation of local batches by using the batch master transaction/apps is not supported as the batches are not replicated to the connected SAP ERP system.
		Design	In SAP S/4HANA it is mandatory to provide the parameter “entitled to dispose” when reading batch master data
	Classes and Character- istics	Interface	The following BADIs must be replaced by equivalent IDOC processing: /SAPAPO/CIF_ENHANCE_BATCH /SAPAPO/CIF_ENHANCE_ERRHDL SMOD_APOCF31 SMOD_APOCF32 SMOD_APOCF035 SMOD_APOCF036 In SAP S/4HANA stack class types 22/23 are used (instead of class types 220/230 used in EWM on N/W stack)
Customizing	Catch Weight	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: /SCWM/TCWTOLGR (TCWQTOLGR) /SCWM/TCWTOLGRT (TCWQTOLGRT) /SCWM/TCWPROC (TCWQPROC) /SCWM/TCWPROCT (n/a) Any custom code accessing these DB tables must be also adjusted.
	Handling Units	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCWM/THUTYP (THUTYP)2. /SCWM/THUTYPT (THUTYPT)Any custom code accessing these DB tables must be also adjusted.
	Whse. Storage Condition	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCMB/TWHSTC (TWHSTC)2. /SCMB/TWHSTCT (TWHSTCT)Any custom code accessing these DB tables must be also adjusted.
	Quality Inspection	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCWM/TQGRP (TQGRP) 2. /SCWM/TQGRPT (TQGRPT)Any custom code accessing these DB tables must be also adjusted.
	Serial Number	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCWM/TSERIAL (TSERIAL) 2./SCWM/TSERIALT (TSERIALT)Any custom code accessing these DB tables must be also adjusted.
	Handling Indicator	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: /SCMB/THNDLCD (THNDLCD) /SCMB/THNDLCDT (THNDLCDT) Any custom code accessing these DB tables must be also adjusted.
	Delivery Priority	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCDL/TDLVPRIO (TPRIO) 2./SCDL/TDLVPRIOT (TPRIT)Any custom code accessing these DB tables must be also adjusted.
	Shipping Conditions	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: /SCDL/TSRVLVL (TVSB) /SCDL/TSRVLVLT (TVSBT) Any custom code accessing these DB tables must be also adjusted.
	Incoterms	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCMB/TSINC (TINC) 2. /SCMB/TSINCT (TINCT)#Any custom code accessing these DB tables must be also adjusted.
	Trans. Group	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SAPAPO/TTGR (TTGR) 2. /SAPAPO/TTGR_TXT (TTGRT)Any custom code accessing these DB tables must be also adjusted.
	Packing Data	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCWM/TPACKGR (TVEGR) 2. /SCWM/TPACKGRT (TVEGRT) Any custom code accessing these DB tables must be also adjusted. Note: Packing Mat. Types and mapping to Packing Groups are unchanged
	Whse. Material Group	DB design	The following tables are no longer used. The data needs to mapped to the SAP S/4HANA tables: 1. /SCMB/TWHMATGR (TWHMATGR) 2. /SCMB/TWHMATGRT (TWHMATGRT) Any custom code accessing these DB tables must be also adjusted.
	ERP Version Control	Function Restriction	DB Table /SCWM/TCTRLPROCS: If in the N/W stack, the contents of this table have the field ERPRELEASE “600”, “500”, “470” or “46C” this is no more allowed in SAP S/4HANA stack.
	Comm, to ERP	Functional Restriction	SAP S/4HANA decentral EWM does not support IDOC based Delivery/GM interface. Thus, the setting QTYPE (Queue Type) = “N” (No Queue) in /SCWM/TWMEQUEUE is NOT allowed.
	Quality Inspection Engine	Functional Restriction	Preliminary inbound delivery inspections (IOT 1) is not supported in SAP S/4HANA decentral EWM. Hence if the DB table /SCWM/QIOTWM has entries with IOT = ‘1’ this will not work, and the processes have to be adapted.
Shipping & Receiving	Freight Order Mgmt.	Functional Restriction	The following BAdIs cannot be used: 1. /SCWM/MAP_HU_SHP_SAP 2. /SCWM/MAP_DLV_SHP All FOM functionalities used need to be mapped to basic/advanced TM
Add-On	AR Warehouse Picker App		The Add-On “SAP AR Warehouse Picker 1.0 Add-On SPxx” (Add-on Software component NWMQC01) is no more supported in SAP S/4HANA.

Conclusion:

The above steps are not a comprehensive list; however, they provide a good guidance for customers/partners/consultants intending to start an SAP EWM migration project. The migration is not simple, yet undeniably achievable – we have already a few customers who have migrated to SAP S/4HANA EWM (both decentral and embedded).

All the best and I wish you all success in the your project.