If you need to set the Invoice Number to be a specific Number or you need to modify the Invoice Number, follow these steps:
- Open Configuration Manager -> Sales Orders -> Order Options.
- Enable the option to ‘Use Order Number as Invoice Number’. Save and close Configuration Manager.
- Edit an existing Sales Order.
- Enter in the Order Number field the number in which you would like to use for your invoice.
- Create your Invoice. Verify the Invoice Number is now set the number in which you set on the Sales Order
If you need to modify an existing Invoice, you would need to first void the Invoice. Then, follow the steps provided above.