The INVTAX table describes how DTD data elements in Invoice Tax map to open interface tables. The invoice tax header element (%AMOUNT.EXTENDED.T;) contains the elements VALUE, NUMOFDEC, SIGN, CURRENCY, and DRCR that map to AP_INVOICE_LINES_INTERFACE.AMOUNT. The invoice tax header element TAXCODE maps to AP_INVOICE_LINES_INTERFACE.TAX_CODE. The invoice tax header element LINENUM maps to AP_INVOICE_LINES_INTERFACE.LINE_NUMBER.