Code specifying the additional charge, see code list at https://big.btwentyfour.com/codes#id4
invoic_Examples
<charges name="freight charge" code="FC" amount="15.00" amountIncTax="18.75" taxRate="25" taxAmount="3.75" /> invoic_XPATH
/b24Message/invoice/charges/@code
invoic_Required
No
invoic_Type
Text
invoic_Sort
23600