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Changing Pegs Using BAdIs 
This procedure enables you to change or check allocations/pegs made by the system before the data is updated on the database. You can use your own customer-specific logic contained in a Business Add-In (BAdI).
1. On the SAP Easy Access menu, choose Tools ® Overview ® ABAP Workbench ® Object Navigator.
2. Choose one of the following:
○ BADI_GPD 17 (Pegging: Customer Specific Adjustment of Assignments)
○ BADI_GPD_10 (Changes to Pegging Tables before DB Update)
3. In the Object Navigator, select development class GPD.
4. Choose Enter.
5. Choose Enhancements ® Business Add-Ins in the tree structure.
6. Choose BADI_GPD 17 and / or BADI_GPD_10 implement your logic.