Partial Proforma Invoices allow customers to view what is considered a partial invoice sent out by a supplier specifically detailing what service or product is intended to be delivered. It should not be recognized as the actual purchase order (PO). Instead, it is considered a partial invoice and can be used by customers to confirm what is expected to be delivered and often details ‘part’ of the order, and usually isn't the entire contracted amount of the service or product. This can be useful when a certain portion of the work has been completed or when the provider anticipates additional charges to occur.