7961f0d2___Accounting_and_ERP_Solutions__Availability
[Windows] F9 (CTRL + F9) [Functionality] To select the Debit Note voucher [Availability] 
At Accounting / Inventory Voucher creation and alteration screen
Short-cut keys or keyboard shortcuts available in Tally ERP9 | TallyDirect - Accounting and ERP Solutions
Availability