Inscrivez-vous ou connectez-vous pour rejoindre votre communauté professionnelle.
From Tally home/main screen (after opening a company)
Press Click on Company Info at right side of the screen, or press ALT+F3
Click on SECURITY CONTROL or press E
Choose TYPES OF SECURITY or press T
Hit ENTER key on Data Entry
you can enter number of days in DAYS ALLOWED FOR BACK DATED VOUCHERS