The Invoice is used to invoice a customer for goods/services the have been provided. Information that applies to the entire invoice document. The Header supports summary amounts for line items, charges, taxes and allowances. It also supports itemizing Header level charges, taxes and allowances for use in credit or debit invoices. In this case Line items are not needed. The summary amounts in the Header include the Line level amounts and Header level amounts. In general an Invoice Line can be aligned with Order Lines. The ItemQuantity and Price are used to compute the Total. The Total is a sum of the Total and any Charges, Taxes or Allowances. The InvoiceHeader type supports summary amounts for line items, charges and allowances. A code for the invoice.Example: Special allowance for preferred customers. The InvoiceLine type supports order line invoicing. Pricing amount for the current line.