A callout cannot invoke a one-way operation

I have created a DBAdapter JCA Client invoking an INSERT operation
JDeveloper generates this WLSD:

<?binding.jca AcmeDBInsert_db_db.jca?>
<wsdl:definitions name="AcmeDBInsert_db" targetNamespace="http://xmlns.oracle.com/pcbpel/adapter/db/AcmePOC_Sharath/Acme_POC_Acme_WMS/AcmeDBInsert_db" xmlns:tns="http://xmlns.oracle.com/pcbpel/adapter/db/AcmePOC/Acme_POC_Acme_WMS/AcmeDBInsert_db" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:plt="http://schemas.xmlsoap.org/ws/2003/05/partner-link/" xmlns:top="http://xmlns.oracle.com/pcbpel/adapter/db/top/AcmeDBInsert_db">
    <plt:partnerLinkType name="AcmeDBInsert_db_plt">
        <plt:role name="AcmeDBInsert_db_role">
            <plt:portType name="tns:AcmeDBInsert_db_ptt"/>
        </plt:role>
    </plt:partnerLinkType>
    <wsdl:types>
        <schema xmlns="http://www.w3.org/2001/XMLSchema">
            <import namespace="http://xmlns.oracle.com/pcbpel/adapter/db/top/AcmeDBInsert_db" schemaLocation="xsd/AcmeDBInsert_db_table.xsd"/>
        </schema>
    </wsdl:types>
    <wsdl:message name="GmAcmeTrackerCollection_msg">
        <wsdl:part name="GmAcmeTrackerCollection" element="top:GmAcmeTrackerCollection"/>
    </wsdl:message>
    <wsdl:portType name="AcmeDBInsert_db_ptt">
        <wsdl:operation name="insert">
            <wsdl:input message="tns:GmAcmeTrackerCollection_msg"/>
        </wsdl:operation>
    </wsdl:portType>
</wsdl:definitions>

the "insert" operation is a one-way operation (no wlsd:output clause)

The problem is that the Service Callout expects a request-reply pattern.

So in this case you must necessarily use a Publish, with Quality of Service "Exactly Once" to execute in the same transaction and with a blocking operation.