Let me share informtion on how to start fresh and start over with invoice numbering.
If you want to start over with Invoice number one, just ensure that you'll have a specific character if you already used Invoice No. 1 in the past. For example, Invoice No. 1A or 01 since the system will not allow duplicate transaction numbers. After you've decided how to start over with your invoice numbers, the next time you'll create a new invoice, the succeeding number will automatically populate.