Drools - Rule execution via KIE server REST not giving response

Question

I'm attempting to execute a rule that was authored using Drools Workbench (business-central-7.17.0.Final-wildfly14.war) via KIE execution server (kie-server-7.17.0.Final-ee7.war), I don't get the expected response when I execute the rule using Postman, REST client.

I've tried setting request headers "X-KIE-ContentType XSTREAM", setting payload tag <insert out-identifier="Employee" return-object="true" entry-point="DEFAULT"> where out-identifier="Employee" is the fact.

Request Payload

<batch-execution lookup="TestBaseSession">
  <insert out-identifier="Employee" return-object="true" entry-point="DEFAULT">
  <com.test.Employee>
    <iEmpId>27</iEmpId>
    <strName></strName>
  </com.test.Employee>
  </insert>
  <fire-all-rules/>
</batch-execution>

Rule file

package com.test;
import com.test.Employee;

//This is the first rule
rule "001"
    when
        emp : Employee(iEmpId==27)
    then
        emp.setStrName("FooBar");
        insert(emp);
        //System.out.println("DDDDD");
end

I expect the output to be something like below (or similar to it),

<response type="SUCCESS" msg="Container Test_1.0.0 successfully called.">
    <result class="execution-results">
        <result identifier="Employee">
            <com.test.Employee>
                <iEmpId>27</iEmpId>
                <strName>FooBar</strName>
            </com.test.Employee>
        </result>
        <fact-handle identifier="Employee" external-form="0:1:850421248:850421248:1:DEFAULT:NON_TRAIT:com.test.Employee"/>
    </result>
</response>

But I didn't get the expected, nor the System.out message isn't printed in Wildfly console, which suggests that the rule isn't executed? any suggestions would be really helpful.