Mastering ABAP: A Step-by-Step Guide to Function Modules and Groups for Modularized Programming

 

Function Modules :-

  • It is a modularization technique.
  • The transaction code to create a function module is SE37.
  • To create a function module, we need to create a function group.

Function Group :-

  • Function group is a container for the function modules.
  • The transaction code to create a function group is SE80.
  • A function group can store up to 99 function modules.

Requirement :-

  • let’s create a function module for sum of two numbers.

1. Creation of function group :-

  • Step 1 :- Go to SE80 transaction code → Object Navigator.



  • Step 2 :- From the drop down select function group.



  • Step 3 :- Give a name of function group.



  • Step 4 :- press enter.



  • Step 5 :- Click on yes a popup screen will appear.



  • Step 6 :- Give short description → press enter → Assign package and transaction request and press enter.



  • Step 7 :- Right click on function group and click on activate to activate the function group.



  • Step 8 :- You will see two includes, will be added after activation of function group.



    • First one will be TOP
    • Second one is UXX
      • Note :- This XX will be replaced the number of function modules created in this function group.

2. Creation of Function Modules for Sum of Two Numbers :-

  • Step 1 :- Go to TCODE SE37(Function Builder).



  • Step 2 :- Give a name.



  • Step 3 :- Click on create button → a popup screen will appear.



  • Step 4 :- Provide function group and short description.



  • Step 5 :- Click on Save → Function Builder screen will appear.



  • Step 6 :- There are always 7 tabs in Function Builder :-

    Tabs :-

    1. Attributes :- Attribute is always the generic or general information of the function module like - date, username, function group name, package name etc.



    2. Import :- Import parameters of the function module.

    3. Export :- Output parameters of the function module.

    4. Changing :- Changing can acts as both input or output parameters.

    5. Tables :- It is for internal tables.

    6. Exceptions :- This tab is used to raise the exception/error.

    7. Source Code :- The purpose of this tab is to write the logic.

  • Step 7 :- In import tab, declare two input parameters.



  • Step 8 :- define a output parameters in Export tab.



  • Step 9 :- Go to source code and write the logic and activate the function module.



Execute the function module :-

  • Press F8.



  • Press F8.



    • You can see the output here.
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