Service Logistics Debrief OIC integration erroring out while creating reservation

Summary:

Debrief is submitted from Field Service and flows to Service logistics via OIC. It is failing while creating reservations (/fscmRestApi/resources/11.13.18.05/inventoryReservations).

Please suggest how to resolve this error.

Error in OIC:

CloudInvocationException [ Fault Details :

<ns2:APIInvocationError xmlns:ns2="http://xmlns.oracle.com/cloud/generic/rest/fault/REST/createReservationNoSerial"><ns2:type/><ns2:title/><ns2:detail/><ns2:errorCode/><ns2:errorDetails><ns2:type> </ns2:type><ns2:title>Bad Request</ns2:title><ns2:errorCode>400</ns2:errorCode><ns2:errorPath>&lt;![CDATA[InboundJaxrsResponse{context=ClientResponse{method=POST, uri=https://icbojb-dev5.fa.ocs.oraclecloud.com/fscmRestApi/resources/latest/inventoryReservations, status=400, reason=Bad Request}}]]&gt;</ns2:errorPath><ns2:instance>&lt;