I am using SalesOrderHeaderV3Entity and my payload is:
<Document>
<SALESORDERHEADERV3ENTITY>
<CONFIRMEDRECEIPTDATE>1900-01-01T00:00:00</CONFIRMEDRECEIPTDATE>
<CONFIRMEDSHIPPINGDATE>1900-01-01T00:00:00</CONFIRMEDSHIPPINGDATE>
<CURRENCYCODE>USD</CURRENCYCODE>
<CUSTOMERSORDERREFERENCE>4518964489</CUSTOMERSORDERREFERENCE>
<ORDERINGCUSTOMERACCOUNTNUMBER>A1020</ORDERINGCUSTOMERACCOUNTNUMBER>
<REQUESTEDRECEIPTDATE>2025-09-25T00:00:00</REQUESTEDRECEIPTDATE>
<REQUESTEDSHIPPINGDATE>2025-09-26T00:00:00</REQUESTEDSHIPPINGDATE>
<DELIVERYADDRESSNAME>Medline Northfield Textile Div 50</DELIVERYADDRESSNAME>
<DELIVERYADDRESSDESCRIPTION>Medline Industries LP</DELIVERYADDRESSDESCRIPTION>
<DELIVERYADDRESSCITY>LITHIA SPRINGS</DELIVERYADDRESSCITY>
<DELIVERYADDRESSCOUNTRYREGIONID>USA</DELIVERYADDRESSCOUNTRYREGIONID>
<DELIVERYADDRESSSTATEID>GA</DELIVERYADDRESSSTATEID>
<DELIVERYADDRESSSTREET>9101 RIVERSIDE PKWY</DELIVERYADDRESSSTREET>
<DELIVERYADDRESSZIPCODE>30122</DELIVERYADDRESSZIPCODE>
<LANGUAGEID>en-US</LANGUAGEID>
<SALESORDERORIGINCODE>EDI</SALESORDERORIGINCODE>
</SALESORDERHEADERV3ENTITY>
</Document>