SAP Development Enhancing SAP(CMOD) User Exits BDT Enhancement Framework BADI Field Exits
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SAP Field Exit implementing within ABAP programs

For this example I am using dta element 'EBELN' from table EKKO. Step 1:
Execute program ‘RSMODPRF’, entering the data element of the field


Step 2:
Create function module when prompted, and add you code to the source section using the parameter ‘INPUT’ as the field value you are checking.




Step 3:
Save and activate Function and execute transaction ‘CMOD’.

Step 4:
Choose option: Goto-> Text Enhancements->Data elements->New DE cust docu.

Step 5:
Enter data element




Step 6:
Save and activate

Step 7:
Execute program ‘RSMODPRF’ again but this time leave data element field blank.

Step 8:
Select the checkbox for the data element you have just created and choose option: Field exit->Activate

This will now be active for all instances of this data element, but you can assign specific program and screen combinations by pressing the ‘Assign prog./screen’ button. You can also change the code you entered in the field exit function module by pressing the ‘Edit FM’ button.