Hi Poonam,
In any business process there will two scenarios only:
1. Sale to customer where you raise "Invoice" by Debit customer to Credit Revenue
2. Return from Customer/ wrong invoice where you raise "Credit Note" by Credit customer to Debit Revenue/sales return
In both the scenario there is no debit note available in system for sure. I am sure when you will create Debit note to customer you will "Debit Customer" which is similar in nature of invoice, then what is the difference between invoice and debit note here?
If there is really a ask for it to print document, you can proceed for customization:
1. Give a marking on Invoice form for Debit note(Yes/No)
2. Create a copy similar to "Invoice" by changing heading as "Debit Note"
3. This report should be printed if "Debit Note" yes is marked on the form
Other than this, i do not think so we have any other option.