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. Specifies the tax point date; the date on which a taxable person should account for tax The InvoiceLine type supports order line invoicing. Cost of goods sold for the line A Cost that is used for alternate Margin calculations. Example for this use case may be SalesMargin or StandardMargin. Other AlternateCost uses may be a Cost used for later reporting or comparison purposes. AlternateCost@type for such uses may include Actual, FIFO, Customer, and others. Other use cases: A Basis Cost which might have been used for Commission or Rebate calculations. AlternateCost@type for such cases could be CommissionBasis or SupplierRebateBasis. To specify vendor rebates that could be claimed and customer rebates that need to be given for the invoice line Pricing amount for the current line.