Module Pool in SAP ABAP?

4 min readOct 4, 2021

ABAP Series Part- 5

In this blog, I will discuss What is Module Pool in SAP ABAP is and How to create a screen and transaction code.
In SAP for performing any kind of task in R/3 system, a transaction code is used. SAP provides a standard set of transaction code to be used, But sometimes, we need to create a client specific transaction. Because in standard SAP may not support that task, or we need to create some screen as per their requirements.

What is Module Pool?

It is a special type of programming where we write code for which it is used to create custom SAP screens. In short in SAP ABAP we can create a specific screen and transaction code as per our requirement.
For execution of Module pool program there is a specific transaction code.
Transaction code for creating module pool programs is SE80.

Prerequisite for developing Module Pool are :

Screen Painter [SE51].
Transaction Code [SE93].
ABAP Editor [SE38].
ABAP Dictionary [SE11].
Menu Painter [SE41].

For more read data dictionary you can check my previous blog or click here.

Screen
It is a layout which is displayed in the output.

Following are the components of the screen.

Screen Attributes
Properties of Screen like screen type, next screen, short description.
Screen Layout
There are 2 ways to create screen layout
1. With help of Data Dictionary
2. With help of available buttons on Toolbar.
Field Attribute
It is used to maintain filed characteristics.
Flow Logic
It will contain the logic related to screen in the form of modules.

Modules

In flow logic we can’t write ABAP statements, directly therefore we write in the form of modules. That's why it is called Module Pool Programming
In Modules 4 Events are there.

PBO(Process Before Output).

Which is processed before the output or screen is displayed.

PAI(Process After Input).

Which is processed after a user action on the screen.

PVO(Process On Value Request.

Which is processed when F1 is pressed.

POH(Process On Help Request).

Which is processed when F4 is pressed.

How to Create a Screen Design?

Go to Transaction Code SE80. Select program from the dropdown and Give name start’s with “Z”

Now press enter click on YES , screen will be pop-up select “With Top INCL” and then click on yes button.

Give the name of TOP Include Starting with “Z” and then click on right check box.

In the Attributes of screen give Title and check module pool types is mentioned already.

Now creating a screen by right clicking on the program which we created and select an option Create-> Screen.

Enter a screen number like 800 and then click on right check box.

In this screen give short title and then save this application.

Now click on the layout button in the application toolbar.

Add a text field and enter text “Welcome to Mayank Chourasia Blog’s”. after that save it and activate it.

At last we need to create a Transaction Code for our program which we created. By right clicking on the program which we created and select an option Create-> Transaction.