With this TDL add-on, you can restrict backdated entries creation and alteration for users in Tally. This add-on works based on the cut-off defined by you and not based on the last voucher entry done in your data. You can even define user-wise different cut-off dates for voucher creation and alteration separately. For e.g. Cut-off date for User - A is 31/03/2021 and for User - B it's 30/06/2021 Refer to the screenshots below of the working module!