Go to Gateway of Tally > F12: Configure > Voucher Entry
Configure different features of your voucher entry screen.
Other features of convenience, e.g., Use Payment/Receipt as Contra are enabled to effect transactions for funds transfer. Tally allows such transactions only through Contra Vouchers.
Take another instance where, you are not permitted to use Journal Vouchers for Cash or Bank transactions. However, recognising exceptional needs, you can override that restriction by enabling the facility here.
Refer Allow Alteration of TDS Rates and Values for more information.