SAP WM vs EWM – key differences.


 In this article I am going to give a comparison between SAP WM Vs EWM with reference to the different processes that are done in a warehouse. 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 an independent 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 customizing 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 functionalities that are available in the versions ECC 6.0  for WM and EWM 7.0  for eWM 
From System documents perspective :
SAP WM has Transfer requests and Transfer orders. Transfer orders are the actual work orders based on which the stock movement takes place within a warehouse .
SAP EWM has a slightly different presentation of these documents . SAP 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  SAP WM, movement type determine the type for Transfer order creation. 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 comparison 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 .

Receive ASN dataYes No
ASN Validation & CorrectionYesNo 
Transporation Unit ArrivalYes No
Manage Transportation UnitYes No
Goods ReceiptYesYes
Putaway Bin determinationYesYes
Unload Transportation UnitYes No
Internal RoutingYes No
SlottingYes No
DeconsolidationYes No
Returns / Reverse LogisticsYes No
Goods receipts optimizationYes No

Inventory Counts / Record AccuracyYesYeseWM:inventory based on products and/or based on storage bins.New feature physical inventory during putaway
Freight Order ManagementYesNo 
Kit to StockYesNo 
Route DeterminationYesNo 
Wave ManagementYesYes 
Picking Bin DeterminationYesYes 
Warehouse Order CreationYesYesEWM =Warehouse order / WM = Transfer order
Work AssignmentYesYes 
Goods IssueYesYes 
Kit-to orderYesYes 
Prodution SupplyYesYes 
Transportation Cross DockingYesYes 
Yard ManagementYesYes 
Labour ManagementYesNo   SAP WM has TRM 
Opportunistic Cross DockingYesYes 
EH&S IntegrationYesNo 
RF support for processesYesYes 
Batch ManagementYesYes 
Material Flow SystemYesNo 
Warehouse cockpitYesNo 
Goods Receipt – OptimizationYesNo 

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