Automation of Rebate and Credit Note

I want to automation of Rebate and Credit Note,

For this I had made new button on action menu of the Rebate Form and write new class for this button (AutoCreditNote) and copy the main method of "PdsRebateCumulateDialog", "PdsRebateProcessDialog" and "PdsRebateApproval" classes which are using manually in the Rebate process and my Rebate is automated but when I copy the main method of "PdsRebatePaymentPost_CreditNote" for  automation of Credit Note it produced compiler error.

I want complete solution for this

thank you

Regards

Nadeem Fiaz