Documentation Required for Function Module

Question

Hi,
Can Provide me the documentation how to create function module in ABAP.
Regards
Ravi

Answer 1

hi,
BAPI Step by step Guidance
BAPI stands for Business Application Programming Interface.
There are 5 different steps in BAPI.
- Create BAPI Structure  
- Create BAPI Function Module or API Method.  
- Create BAPI object  
- Release BAPI Function Module.  
- Release BAPI object.
Step1. Creating BAPI Structure:  
- Go to <SE11>. 
- Select Data Type & Enter a name. 
- Click on Create.
- Note: Always BAPI should be in a development class with request number (Not Local Object).
- Select Structure & hit ENTER.
- Enter the fields from your database. Make sure that the first field is the Primary Key Field.
- Then SAVE & ACTIVATE.
Step 2. Creating BAPI module: 
- Enter TR.CODE <SE37>.
- Before entering any thing, from the present screen that you are in, select the menu
   Goto -> Function Groups -> Create Group.
   Enter a name (ZBAPI)
   Let this screen be as it is and open another window and there, enter TR.CODE <SE80).
   Click on the Third ICON that says Inactive Objects. 
   Select the group that you just created and click on Activate. 
   Notice that the group you created will disappear from the list of inactive objects.
- Go back to <SE37> screen and enter a name and hit <ENTER>. Then enter the group name that you just created and activated.
NOTE: When you release a function module the respective group will be attached to that particular application. It cannot be used for any other application. NEVER include an already existing group that is attached to another module.
Now click on the first Tab that says [ATTRIBUTES] and select the radio button that says remote-enabled module since we will be accessing this from any external system.
Then click on the second tab that says [IMPORT].
Enter a PARAMETER NAME, TYPE and the structure you created in the first step. Also select the check box u2018Pau2019. All remotely enabled functional modules MUST be Pa enabled, where Pa means u2018Passed by Valueu2019 and if you donu2019t select u2018Pau2019, then that means it will be passed by reference..
Then click on tab that says [EXPORT].
Enter the following as is in the first three fields 
  RETURN        TYPE        BAPIRETURN (These 3 field values are always same)
  Here also select u2018Pau2019 meaning Pass by value.
Note: BAPIRETURN contains structure with message fields.
Then SAVE and ACTIVATE.
Ram  .
Edited by: Ramakullay Challa on Jun 2, 2009 10:31 AM