3800443 - Error: "Schema Validation failed for cXML-0000-OrderRequest.. Suggested Action" for OrderRequest document (42K) sent to SAP Integration Suite, managed gateway

• While sending a purchase order to the SAP Business Network from SAP S/4HANA Public Cloud via SAP Integration Suite, managed gateway using 42K integration, the destination path is not populated.
• Document fails during transmission with error:

Schema Validation failed for cXML-0000-OrderRequest.. Suggested Action : Please check the attachment for error details.For implementation guidelines ,please refer to corresponding refer to corresponding cXML specs at Integration Portal -> Resources-> Implementation Guides.Please contact support with ErrorCode:CIG-PLT-00623.

• Detailed error logs when downloaded show below:

Validation failed for: com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchema@608c1b17
errors: [
org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'BusinessPartner'. One of '{BillTo}' is expected., Line : 1, Column : XXXX
]. Exchange[XXXX-XXXX]

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• Managed Gateway for SAP Business Network - Order
• SAP S/4HANA public cloud integrated via SAP Integration Suite, managed gateway (formerly known as CIG) 

SAP Integration Suite, managed gateway all versions ; SAP Integration Suite, managed gateway for spend management and SAP Business Network all versions ; SAP Integration Suite, managed gateway for spend mgmt and SAP Business Network for SAP S/4HANA all versions

cig, cxml, schema validation, cvc-complex-type.2.4.a, saxparseexception, billto, businesspartner, orderrequest, partytype billto, streetname, purchase order, mapping, destination path, s4hana, ci, failed, retry, schema error, document mapping , KBA , BNS-ARI-CI-AN-PO , Managed Gateway for Business Network - Order , Problem