chapter 01_user exits

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2005 IBM CorporationUser Exits | 8.01 March-2005

User Exits


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2005 IBM Corporation2 March-2005User Exits | 8.01

Objectives

The participants will be able to:

Discuss the procedure of modifying SAP Standard program through procedure SSCR

(SAP Software Change Registration).

Locate, code and implement Function exits.

Differentiate between CALL FUNCTION and CALL CUSTOMER-FUNCTION

statements.

Identify Projects and Enhancements and use the transactions CMOD and SMOD.


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Overview

If you try to change the SAPprogram SAPMF02K, you will

be prompted to enter the accesskey for that object.

It mandatory for users to register all manual changes to SAP source coding andSAP Dictionary objects through a procedure called SSCR.


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SAP Modification

After you enter the appropriate access key, you will be able to modify a SAPstandard object. You should avoid making repairs to SAP objects/code.


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Obtaining Object Access Key

To obtain the access key for changing a SAPStandard object, either run transaction OSS1 or

go to the site www.service.sap.com.


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Obtaining Object Access Key (Contd.)

Go to the registration tab

Go to Register Objects


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Obtaining Object Access Key (Contd.)

Select your server by matching

installation number.

Provide the Object name, SAP

Release and click on the

Register tab.

The Registration Key for the

Object will be displayed.


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Different Enhancement Techniques

SAP 3 Tier Architecture

PRESENTATION :

Field Exits (SAP would no longer support Field Exits)

Screen Exits

Menu Exits

APPLICATION:

Program exits ( Function Exits, BAdis, Business

Transaction Events, Substitution Exits )

DATABASE

Append Structure


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Information on existing User-Exits

Using transaction SPRO, one can information along with detailed documentationon the Exits available for areas of concern.


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Function-Exits

*----------------------------------*

* include zxf05u01.*

*----------------------------------*

This INCLUDE

program is where youwill write thecustomer-specificcode.

call customer-function 001...

functionexit_sapmf02k_001.

include zxf05u01.

endfunction.

SAP Original CodeSAPMF02K

Function Module INCLUDE Program

This INCLUDE programwill not be overwrittenwith an SAP upgradebecause it is not SAP

original code.


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Call Customer-Function Versus Call Function

The CALL CUSTOMER-FUNCTIONstatement will only execute thefunction module if the moduleis activated.

call function EXIT_SAPMF02K_001

Both of these CALL statements refer

to the function module

EXIT_SAPMF02K_001.


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Business Case Scenario

UPDATE LOG

Vendor #Vendor name

When the user updates a vendor record, you want toinsert a record into an update log that contains thevendor number and name of the updated record.


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Steps to Coding a Function-Exit

1. Locate Function-Exit(s)

2. Go to Function Module

3. Create INCLUDE Program

4. Code in INCLUDE Program

5. Activate Function-Exit


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Locate Function-Exit(s)


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In program SAPMF02K, search

for the string call customer-function in the main program to

find all of the function-exit(s) inthe program.


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Double-click anywhere onthe call customer-function001 statement to go to

that line in the SAP program.

In program SAPMF02K, there is

only one function-exit at line 83 of

MF02KFEX.


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Go to Function Module

Double-click on 001 of theCALL CUSTOMER-FUNCTION

001 statement in the SAPprogram to go to the functionmodule EXIT_SAPMF02K_001.


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Create INCLUDE Program

Double-click on the INCLUDEZXF05U01 statement in thefunction module to create theINCLUDE program.


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Code in INCLUDE Program

*------------------------------* INCLUDE ZXF05U01*------------------------------

if sy-uname = SANGRAMC.

endif.

Write code in the include program. Whatever logic you add here will affect all

SAP standard transaction where this

particular User Exit is being called.

Put all your code within the username

check, while you are at the middle of theuser exit development. So, that your logic

in the exit (which is incomplete now) does

not affect others users in the system.

At the end of the development, when you

have tested that your logic is correct,

remove the username check. So, the

additional logic (tested & verified now) is

now triggered for all users in the system.

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Activating Function-Exit

X

X

PROJECT 1

(can be activated/deactivated)

Enhancement1

Enhancement2

FunctionExit

ScreenExit

FunctionExit

PROJECT 2

(can be activated/deactivated)

Enhancement3

FunctionExit

You do not actually activate a single function-exit; instead, you activate aPROJECT that will include your user-exit(s).

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User-Exit Transactions

CMOD : This transaction allows you to create a PROJECT by identifying itsENHANCEMENT(S). After determining all of the ENHANCEMENTS that are part

of the PROJECT, you will have to activate the PROJECT. You will still need to code

your user-exit; therefore, you may want to wait until this step is completed before

activating the PROJECT.

SMOD : This transaction allows you to create an ENHANCEMENT, which you will

include in a PROJECT, by identifying its COMPONENT(S). In the case where SAP

has already created an ENHANCEMENT for its pre-defined user-exits, you will not

need to use transaction SMOD; instead, you should just use transaction CMOD.

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Transaction CMOD

In transaction CMOD, type in thename of your project and pressthe CREATE pushbutton.

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Transaction CMOD

Once you SAVE your project,you can add as manyenhancements as you want bypressing the SAPenhancements pushbutton.

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Transaction CMOD

Add the enhancements youwant included inthe project.

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Transaction CMOD

After saving your project,you need to ACTIVATE it.

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Transaction SMOD

With the name of the enhancement,you can display its components.

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Transaction SMOD

In the case of enhancement

SAPMF02K, there is only one

user-exit a function-exit usingthe function moduleEXIT_SAPMF02K_001.

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Additional Information

You can use table MODACT to find the Project an Enhancement is included in.

You can use table MODSAP to find the Enhancement for a Function Exit.

Component or Function Exit

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Summary

You should avoid making modifications/repairs to SAP objects/code wheneverpossible.

It mandatory for users to register all manual changes to SAP source coding andSAP Dictionary objects through a procedure called SSCR.

To obtain the access key for changing a SAP Standard object, either runtransaction OSS1 or go to the site www.service.sap.com.

The concept of a function-exit involves various points in original SAP programs

that have calls to specific function modules.

CALL CUSTOMER-FUNCTION statement will only execute a function module if

the function module is activated.

CMOD : This transaction allows you to create a PROJECT by identifying its

ENHANCEMENT(S).

SMOD : This transaction allows you to create an ENHANCEMENT, which you willinclude in a PROJECT, by identifying its COMPONENT(S).

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Questions

How do you obtain access key for changing a SAP standard object ? What are the steps for coding a Function Exits ?

What does CMOD and SMOD do ?

chapter 01_user exits

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