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Dear Consultants/Experts,

In this blog i like to furnish the information that i received as a Query/Question from the consultants, new to SAP WM and even new to Warehouse and related activities and quite interesting one Mr.Ji Wang sent some query related to mapping the concepts of Warehouse in SAP. I even felt the Question speaks more in depth of his knowledge in warehouse design. Quite amazing !!!

I tried to answer the Questions i have received from our friends and shared here few for knowledge purpose.

Why we need WMS that too SAP WM ?

This is more often questioned one.. but i think below are the more suitable answer [advantages] and we have some more additional advantages in actual stage.

Inventory accuracy

Safety stock- reduces shortages, reduces variability

reduces labor invested in cycle counting

reduces labor dealing with inventory discrepancies..

reduces capital investment in Inventory…

Improve Productivity

Automate manual process using RF or Voice.

provide productivity reporting for employee-Management.


Here is the very beautiful question which was asked in one Warehouse/logistics/Supply chain experts seminar/ discussion held @ Chennai, India in the year 2010. I like to reveal those points i have collected.

based on the Warehouse process how implementation and usage of RF technology helps the business team to measure the performance and what is the indicator to get determined against each warehouse business process ?


Important point to consider-

Process- Goods Receipt-

reduce error during key-in transaction – here the indicator is operation time per day…

reduce step for doing the transaction-   here the indicator is persons per day..

Process- Check out

reduce error during key-in transaction – here the indicator is operation time per day…

reduces processing time-                       here the indicator is persons per day..

Process- Check In

reduce error during key-in transaction – here the indicator is operation time per day…

reduces processing time-                       here the indicator is persons per day..

Stock status

identified stock status and activities such as interim transfer- here the indicator is Operation time

Bin Stock

Stock & batch are determined on  hand held real time check via Hand held terminals connectivity- here the indicator is Operation time..

Physical Count

Reduce paper and manual process-

stock control

stock accuracy

reduce error during key-in transaction

reduces processing time-

Here the indicators observed are stock losses and stock write-off…


How to determine Material flow system is required to get mapped in SAP ? is it mandatory?

Answer is – ‘not mandatory’- depends on the warehouse set-up and business requirement from the client- based on that we need to advise the client. In the below picture we can use either vmu for moving the materials In/out of Warehouse or a conveyor. simply to carry large volume of material- conveyor is used to avoid wastage of time, simplify transport of materials within an warehouse, quicker and some times to avoid human or mechanical means of handling cover efficiently huge volume of customer orders and putaways..

What is warehouse cycle or Warehouse process ? I heard control cycle but not sure what is really meant by Warehouse cycle.. i have come across this question in an interview ?

From your Question i thought interviewer looked upon the actions/activities performed in a day to day Warehouse. it consists of both Inbound and outbound Operations in a normal warehouse.

Inbound triggers from Purchase order.

Outbound normally from Sales order.

How Cloud network is utilized in warehouse ?

I hope below diagram will be more useful to understand the basic details on cloud set-up. it is very basic layout and not involved in describing more technical features..

Please see Cloud set-up -in combination with RF set-up

Here is the pic showing -RF tag functionality..

here for our understanding – I am sharing RF Tag picture – for this i have photo-copied the model of old tag.,. in recent times it might change and for understanding purpose i have shared this….

How warehouse automation devices/components which supports or helps SAP to function and control warehouse activities.. ?

For this Questions- I would like to add a pic which describes the automation components or devices…to support SAP to control efficiently the warehouse..

Here the corporate office, Warehouse and network distribution [printers, hand held terminals and automated devices connection]  is schematically represented…


  1. Which decides the success of the RF Antenna selection? Coverage and range will be considered pre-dominant and based on that we have many Antenna types directional, Omni directional[360 degree coverage], where as Directional antennas are specific to direction ..i mean better to explain with the example – we have vehicle headlight which covers a particular area and not all the direction.. hope it helps to understand..

      2.What is the type of Antenna used in Warehouses ?
Omni directional provides 360 direction wise coverage of signals and can be used in both Indoor and outdoor RF applications. Coverage and Range will be the driving factors in choosing RF Antenna and Omni directional antenna will best suit this application.

How to check the Omni directional antenna’s are good ?
based on Antenna polarity- here it is too technical but it is unavoidable to skip Omni directional Antennas are in general dual polarized- both horizontal and vertical wise it will cover the signals..polarization represents to the orientation of electrical field component of an electromagnetic wave with respect to the earth space..emf wave composed of both electrical and magnetic waves propagating perpendicular to each other. Radio frequency wave are electromagnetic in nature..

what is the antenna frequency range usage in Warehouse ?
900, 2400 & 5000 MHZ frequency bands normally used in warehouses- this is common for WM or EWM managed warehouses..this bands are used out of control and does not require licensing from government…these ranges of bands are used
in commercial, consumer based applications..

RF Kit/Signal Boosters

what is the expected Antenna Gain ?
The choice of gain depends on system design, coverage and range and Antenna transmit power. normally high range antenna gain is more prime most thing is Gain and Antenna type plays crucial role.. so gain is relative measure of Antenna ability to transmit RF signals in particular direction as expected or pattern.

How to fix the Antenna Device- ?

Actual Picture of RF Amplifier used in Warehouse or any industrial application

what is the unit to be used for measuring Gain?

how to determine Anternna’s perfomance ?
it is determined by the distance between the Antenna and the application device
we can it as line of sight..
Full line of sight- there is no obstacle between the Antenna and the destination
near line of sight – partial obstruction such as tree tops, biulding b/w RF Antennas
Non- line of sight – there is an obstacle or thing b/w the 2 Antennas or the application device.

How to reduce the Antenna signal path loss ?
we need to maintain proper dryness and need to select the antenna installation and building in between there is no much tree, water- i mean ponds..etc..
normally in power plants etc i have seen ash ponds for deposoiting the ash from flyash system from we need to take proper selection, walls of the building should be dry and not wet..
This is to be more important when doing out-door antenna installation.

Warehouse AP and antenna choice

What are the RF Warehouse management hardware-software requirement ?

Please refer the link

Please let us know the RF Gun To SAP Connection

Can you please describe about RFID Preparation details, Installation and Configuration details ?

RFID- preparation, Installation & Configuration – I am seeing very nice information shared by our SCN experts…

What are the types of Amplifiers?

Class A, B, AB, C, T- this are defined based on the Conditions of signal coverage..

why we need RF Connectors ?
A coaxial RF connector (radio frequency connector) is an electrical connector designed to work at radio frequencies in the multi-megahertz range.
RF connectors are typically used with coaxial cables and are designed to maintain the shielding that the coaxial design offers.
AMC connector (Amphenol Micro Coaxial)
AMMC connector (Amphenol Micro-Miniature Coaxial)
HFM connector (High-Speed FAKRA-Mini), used in the automotive industry.
Hirose U.FL connector.
Hirose W.FL connector.
IMP connector.
Mini-SMB connector.
MMCX connector.

What are the types of RF Modules?

Transmitter Modules: A transmitter module is a small device used in transmitting radio waves and also modulating the wave to carry data.
These devices are usually implemented alongside a micro controller, which provides data to the module to be transmitted.

Receiver Modules: RF Receiver Modules is used for receiving the modulated RF signal and demodulating it. There are two types of receiver module,
namely superheterodyne receivers designed using a series of amplifiers to extract data from a carrier wave and super-regenerative receivers in which operation varies according to change in temperature and power supply voltage.

Transceiver Modules: These devices are a mix of both transmitter and receiver. Such devices are designed in either Half-duplex operation or Full duplex modules which are expensive due to its added complexity.
System on a chip (SoC) Module: it is very similar to a transceiver module, but is created with an on-board micro controller. This controller handles radio data packetisation or managing a protocol.

What are the types of RF Cables?

RG-6/UQ 75 This is “quad shield RG-6”. It has four layers of shielding; regular RG-6 has only one or two
RG-7 75 Low loss at high frequency for cable television, satellite television and cable modems
RG-8/U 50 Amateur radio; Thicknet (10BASE5) is similar.


What are the important points to be noted during RF Configuration in SAP?
Steps in SAP RF Implementation (Scanning):
SAP WM configurationSAPConsole / SAPWebconsole/ ITS Mobile
Telnet server configuration
Network Security design and SAP RF architecture
ABAP development (SAP RF programming) in case standard LM** tcode does not meet the business requirement.


Can you please tell me on Telnet ?

Telnet is a network protocol used on the Internet or local area networks to provide a bi-directional interactive communications facility. Typically, telnet provides access to a command-line interface on a remote host via a virtual terminal connection which consists of an 8-bit byte oriented data Connection over the Transmission Control Protocol (TCP). This translates information from wireless RF handheld to SAP R/3 through a character based screen.

For Telnet connections the following are required:
Window NT/2000/XP should be installed.
Telnet software should installed and configured.
A profile defining the host IP address of the telnet/Sap-console server and type of emulation that the RF device should use (such as VT220 emulator) must be configured for each RF device.

  • Details given here may become obsolete – but in general this are the basic information one can understand how the hardware devices are structured to bring efficient network..nowadays due to rapid development of technology we have more advanced, sophisticated and more powerful devices available in Market.

what is Wall mounted scanners or RF Mounted scanners ? Hand-held scanners

From the Question itself we have the answer. Normally in big warehouse like coke, Pepsi, or Ford companies they will use mounted scanners which is located near to the conveyor where the material+ HU/SN is moving.. I like to share the below pic for better understanding..

Hand held scanners – in other hand -user can handle by own and it is not mounted. and it is more useful in small warehouse and user can move and here and there..and scan the HU’s.

Hand-held RF scanners in a Warehouse

I hope the QA will be more useful for newbies and even those who like to know about RF devices and installation.

What is Zebra printer ? my client is telling they are using to pallet printout using Zebra.. can you have any picture related to it.?

Yes it is used for scanning HU labels in warehouse/ gets the name Zebra from the type of printout containing alternatives black and white stripes which describes the codes/spec of an HU used or attached to the material/Delivery. here i am sharing the Pic

I have shown SAP WM Print control steps -configuration to be defined in transaction OMLV.

Here we can see end to end logistics Process- prepared for giving Demo for the client.

Please find the document containing step by step SAP Warehouse management configuration. This is really useful for the consultants interested to enter SAP WM Projects.

I hope this documents will help them to reach thier Goal and Career aspiration. Also they can understand how SAP is automating the Warehosue operations and minimize the cost of stock handling & montoring plus reducign the human efforts, avoiding time consumption during inventory handling and also physical inventory process..SAP efficiently handles stock placement & stock removal process. This document will help all the people to know the Logistics configuration. My document was published in website and due to its huge content i like to share the web-link.

In this blog i have covered all the WM Concepts. Please find the web link for the complete configuration Details.

For below concepts – Please refer the weblink shred. link containing document prepared by me.


1.             Concept of Warehouse Management  

Master Data

Define control parameters for warehouse no

Define Number ranges

Define Storage Type

Define Storage section

Define Storage Bins

Define Blocking Reasons

storage Bin type

storage unit type

Define Storage Bin Structure

Define field usage – Material master

Define Storage Type Indicators

Define Storage Section Indicators

Define Storage Bin Indicators

Storage type search

Storage Section search

Storage Bin search

stock placement or stock removal strategies in an optimum way.  explained in my blogs

Warehouse Management system supports the following Stock placement strategies:

Fixed storage bin

Open storage

Addition to existing stock

Empty storage bin

Pallets (storage units)

Bulk storage

Near to picking fixed bin

No strategy (manual bin location assignment)

Stock Removal Strategies

A picking strategy in the Warehouse Management System refers to a procedure whereby the system searches during a pick for a suitable quant within a storage type or a warehouse number.

The Warehouse Management system supports the following picking strategies:

  • FIFO (First In First Out)
  • Strict FIFO
  • LIFO (Last In First Out)
  • Partial quantity
  • Large/small quantities


  • process indicator (for example, stock placement or removal)  
  • storage type indicator from the material master  
  • stock category indicator  
  • special stock indicator  
  • storage class  
  • water pollution class (WPC)
  • reference movement type

Activate Storage Type Search

Activate Storage Section Search

Activate Storage Bin Search

Activate Storage Bin Type Search

Storage unit types

Defining storage type control for strategies..



In this unit, you set the following activities in the Warehouse Management system:

  • Transfers
  • Differences
  • Print control
  • Physical inventory
  • Appointments
  • Define transaction parameters



In this section, you set the configuration for the transfer of goods.

This includes the following:

1.     Transfer types

2.     Movement types

3.     Requirement categories

4.     Posting changes and stock transfers

Define Shipment Types

Define Movement Types


Define Stock Transfers and Replenishment Control


Confirmation Control

Confirmation Requirement

Two-Step Confirmation

Seperate confirmation for Pick & Transfer

confirmation per storage type

confirmation per movement type

Define Print Control

Define print control for warehouses with Storage Unit Management.

  • Spool Indicator
  • Print code


  1. Create the spool indicators for each warehouse number.
  2. Create the dependent printers for label printing.
  3. Define the sort profile for multiple processing.
  4. Create the print codes for each warehouse number.
  5. Assign the printers to the individual movements.
  6. Assign the printers to the picking areas.
  7. Assign the printers to the storage types.
  8. Assign the print codes to the movement types.
  9. Assign the print reports to the warehouse numbers.
  10. Assign the print control to the multiple processing runs.
  11. Using the analysis program, check whether the settings comply with your needs.


The following print programs are available:

  • RLVSDR40 (general print program)  MWMD0001 : EXIT_RLVSDR40_001
  • RLKOMM40 (multiple processing)    MWMD0002 : EXIT_RLKOMM40_001

Both user exits allow you to control the process of printing transfer orders. The two user exits also have the same transfer parameters. If you want a modification to become effective in both print reports, you must activate both user exits and include the code you have written in shared routine. This is possible since both user exit function modules are contained in the same function group.

SAP WM Print control is not same as the PO, GR and other document printing process. here there is no output determination procedure followed.

We can take WM TO Print in LT31

Activities list mentioned above shown with screen shots…

Analysis shows if any customized Print control defined for a warehouse. below shows no form developed and there is no customized Development Involved.

Physical Inventory

Define Physical inventory per Storage type

Define Differences and Document Limits

  • Inventory movement types
    • 711 (Clear inventory difference)
    • 712 (Post inventory difference)
  • Document items
    • 50  (Items per system inventory record)

Please find below SAP WM Link for step by step configuration

Please find below SAP WM Project Questionnear document for consultants new to SAP WM and also as refreshing guide for the those experienced and knowledge persons in SAP WM.

I hope this will definitely useful for both the consultant & user community in knowing how SAP will help to ran the day to day routine & process.

Thanking you All..

Please refer my blogs for SAP WM Related content


SAP WM –Process, Functionality, Scope, Benefits, Advantages, Disadvantage- Complete Reference-Part 1

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 2

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 3

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 4

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 5

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 6 (Cut over activities Details)

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 7 (Comparing 4.6 C & ECC 6.0 WM Screens)

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 9 (Automatic Picking, Packing, Batch Determination, 2-Step Picking in Warehouse:- Improves Warehouse efficiency and Performance Optimization)

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 10 (IDOC’s used in SAP WM)

SAP WM- Process, Functionality, Scope, Benefits, Advantages, Disadvantage-Complete Reference-Part 10 (IDOC’s used in SAP WM)



Shivakkumar Geetha Venkatesan

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  1. shivakkumar Geetha venkatesan Post author

    Thanks for the valuable comments and message shared. here i am adding the HUM related links created by Christina Rosa – it is very useful to all.

    I hope it is more useful for the guys working in SAP HU + SAP WM/MM. we can considers Christina’s documents as master reference. It is more appreciated. Thanks Christina.



  2. shivakkumar Geetha venkatesan Post author

    Hi Fiona, Linn, Grace, Rebecca, Wang, Dan Yang, Jian, Mary, Jacky Yan, Alvin, Liu, Leon, Zhao, ella feng, Cindy, Li, Ting Qiang,

    Thanks for the wonderful mail and appreciation. I feel proud.

    Please find the SAP WM Configuration Document posted by me in SAP website and so that i have not repeated the same in this blog.

    Thanking you.




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