Modularization Techniques: Function Module

 Function Module:

  •  The function modules are global modularizations objects.
  • The functions modules can be called anywhere in the same system and in another system also.
  •  The T-code ‘SE37’ is used to work with the functional modules.
  •  The functional modules should be assigned to a function group.

Function group: it is a collection of function modules. 

Steps to create Function module:

  •  Goto T-code 'SE37'.
  • Enter FM name and click on 'create'.
  • Enter input parameters in 'Import' Tab.

 

  •  Enter Output parameters in Export tab.

 

  •  Enter Exceptions in Exceptions Tab.


  •  Write the below code in 'Source code' tab.

 

Calling Function Module through Program

REPORT ZVB_ADDITION.
TABLES:VBAP.
PARAMETERS:P_A TYPE I,
           P_B TYPE I.

DATA:lv_C TYPE I.

CALL FUNCTION 'ZVB_DIV'
  EXPORTING
    v_a            = p_a
    v_b            = p_b
 IMPORTING
   V_C            = lv_c
 EXCEPTIONS
   NOT_ZERO       = 1
   OTHERS         = 2
          .
IF sy-subrc <> 0.
  MESSAGE 'Input can not be zero' TYPE 'E'.
ELSE.
WRITE lv_c.
ENDIF.

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