Positive vs negative invoices

Positive and negative invoices are generated when you duplicate invoices.

Positive Invoice

This option means that you are creating an invoice as a duplicate of the invoice that you have currently on site.

Negative Invoice

This option is used when a product needs to be sent back to the inventory. There are cases when clients return some merchandise and products are sent back. This means that the invoice for those products must be refunded. Thus, the negative invoice will refund invoices and adjust the inventory for the products that are sent back and reflect these invoices as a negative invoice.