To repeat the narration entered in the previous voucher involving the same first ledger accounts, we need to press

Alt + R is pressed to repeat the narration entered in the previous ledger involving the same first ledger account. For instance narration of Wages expenses will be similar. So in payment voucher debiting Wages Expenses, press Alt + R at narration field, the narration of previous voucher with Wages Expenses as first ledger account will be copied.