SAP WM vs EWM :


 SAP WM is now a part of SAP Logistics execution module and has undergone several releases from the first time it was introduced by SAP as a independant       warehouse solution in the  R/2 environment. From 2006 we see it in its most developed form as a part of LES  which is available as release ECC 6.0 . 

SAP eWM is similar to SAP WM functionality but with more flexibility in customising like the warehouse structure or picking/put away processes. Also new concepts like activity areas, Work Centers, and Resources are incorporated into SAP EWM .


As per SAP , eWM is not projected as a replacement to WM but more as a robust and flexible alternative to WM .

From what I could understand ,here I will compare both the solutions in terms of their functionalites that are available in the versions ECC 6.0  for WM and EWM 7.0  for eWM 

From System documents perspective :

WM has Transfer requests and Transfer orders .Transfer orders are the actual work orders based on which the stock movement takes place withing a warehouse .

eWM has a slightly different presentation of these documents .eWM has Warehouse order which is similar to a WM Transfer order and further a Warehouse task which is similar to Transfer order line item.

In  WM movement types that determine the shipment type in Transfer order .
In eWM there is a concept of warehouse process type which determines warehouse task creation with reference to reference document types

In WM printing is controlled by setting up configuration that is primarily based on movement type .
In eWM there is new concept called post processing framework.It has a condition table concept with action profiles.



From Architecture perspective:

SAP WM is primarily designed as a central warehouse which is a component of Logistics execution in the same ERP system and integrates with other logistics modules .

SAP eWM  system is designed to run as a Decentralized system.Although it can be deployed in the ERP system it is more commonly considered as an application in the SCM server landscape.

From processes / functionality perspective: Given below the comparision in Yes /No format for the various functionalities offered in SAP ewM .For a similar functionality not available in SAP WM I have mentioned as No .



  eWM WM Comments
INBOUND PROCESSING      
Receive ASN data Yes  No  
ASN Validation & Correction Yes No   
Transporation Unit Arrival Yes  No  
Manage Transportation Unit Yes  No  
Goods Receipt Yes Yes  
Putaway Bin determination Yes Yes  
Unload Transportation Unit Yes  No  
Internal Routing Yes  No  
Slotting Yes  No  
Deconsolidation Yes  No  
Putaway Yes Yes  
Returns / Reverse Logistics Yes  No  
Goods receipts optimization Yes  No  


INHOUSE PROCESSESING eWM WM Comments
Rearrangement Yes No  
Inventory Counts / Record Accuracy Yes Yes eWM:inventory based on products and/or based on storage bins.New feature physical inventory during putaway
Replenishment Yes Yes  
Freight Order Management Yes No  
Kit to Stock Yes No  


OUTBOUND PROCESSING eWM WM Comments
Route Determination Yes No  
Wave Management Yes Yes  
Picking Bin Determination Yes Yes  
Warehouse Order Creation Yes Yes EWM =Warehouse order / WM = Transfer order
Work Assignment Yes Yes  
Picking Yes Yes  
Packing Yes Yes  
Staging Yes Yes  
Goods Issue Yes Yes  
Kit-to order Yes Yes  
Prodution Supply Yes Yes  
CROSS PROCESSES eWM WM Comments
Transportation Cross Docking Yes Yes  




Yard Management Yes Yes  
Labour Management Yes No    SAP WM has TRM 
Opportunistic Cross Docking Yes Yes  
 
SUPPORTING PROCESSES eWM WM Comments
EH&S Integration Yes No  
RF support for processes Yes Yes  
Batch Management Yes Yes  
Material Flow System Yes No  
Warehouse cockpit Yes No  
Goods Receipt - Optimization Yes No  

 


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