Reference to TU line number, used in pack orders.
ordrsp_Examples
<documentReference documentType="BuyerOrder" id="555666" date="2020-08-25" lineNo="2" parentLineNo="1"> ordrsp_XPATH
/b24Message/orderResponse/item/documentReference[@documentType="BuyerOrder"]/@parentLineNo
ordrsp_Type
Text
ordrsp_Sort
11300