Below is my .hbm.ml file contents.
wmis_service_master is parent table. other one is child table.Child table 
has composite key(id+ctr).

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping assembly="wmis.app" namespace="wmis.app.Models" 
xmlns="urn:nhibernate-mapping-2.2">
  <class name="wmis_service_master" table="wmis_service_master" >
    <cache usage="read-write" />
    <id name="sm_id" column="sm_id" type="Int32">
      <generator class="native" />
    </id>
    <property name="sm_svc_date" />
    <property name="sm_veh_num" />
    <property name="sm_svc_type" />
    <property name="sm_client_id" />
    <property name="sm_client_type" />
    <property name="sm_author" />
    <property name="sm_creation_date" />
    <property name="sm_oil" />
    <property name="sm_mileage" />
    <set name="ServiceDetails"  cascade="all" inverse="true">
      <key column="sm_id"/>
      <one-to-many class="wmis_service_detail"/>
    </set>

  </class>
  <class name="wmis_service_detail" table="wmis_service_detail" >
    <cache usage="read-write" />
    <id name="sd_svc_ctr" column="sd_svc_ctr" type="Int32">
      <generator class="native" />
    </id>
    <property name="sd_svc_required" />
    <many-to-one name="ServiceDet" class="wmis_service_master" 
column="sd_svc_no" />
  </class>
</hibernate-mapping>

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