HOW TO CHANGE SALES INVOICE NUMBER FOR NEW FINANCIAL YEAR

You can use any of the following methods of voucher numbering:
Automatic: Select this if you want to automate the number for vouchers.
Enable Use advanced configuration to define the prefix and suffix for the voucher numbers.
Automatic (Manual Override): Select this if you want to automate the number for vouchers, and manually override the automated number, if required. For example, if the voucher is auto-numbered as 10, you can manually change it to 21. The next voucher number will be 22.
You can set Prevent duplicates to Yes, to avoid duplicate voucher numbers during entry. You can enable this option only if you have not recorded any transactions using this voucher type.
Manual: Select this to manually enter the voucher number in each voucher.
You can set Prevent duplicates to Yes, to avoid duplicate voucher numbers during entry. You can enable this option only if you have not recorded any transactions using this voucher type.
Multi-User Auto: Select this option to enable the allotment of subsequent voucher number in a multi-user environment.
None: Select None to disable the voucher numbering.