An invoice usually corresponds to a purchase order
When an invoice is issued corresponding to a purchase order from a buyer, the products have to correspond to the product description stated in the document. The buyer refers to their PO number or tracking number in the invoice to facilitate payment. The description of the products or goods, the unit price and the sum of the charges are all included in the invoice.
The invoice may be paid in one lump sum payment or multiple payments. The documents will state the method and date of payment and in some cases charges and penalties for late payment.
sales invoice template
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