Payable is a transaction that represents an invoice from a supplier. A payable is an open item, approved and ready for payment, in the Accounts Payable ledger. In some systems it may be called a voucher. Compare to PurchaseLedgerInvoice, which represents a not yet approved supplier invoice. The Tax element contains any tax information such as the taxable amounts and the tax codes. It is optional and used to summarize tax amounts across all the document lines. The principal intent of this data type is for use as a memo item Lines on the payable document. Invoice line or credit memo line are examples of a Line