How do you prevent the PSCAMA from being in the XML when the Payload is being sent?

How do you prevent the PSCAMA Record from being in the XML when the Payload is being sent? Or how would you use PeopleCode to remove the PSCAMA?  This is an outbound Synchronous Service Operation with a RowSet Message.

<?xml version="1.0"?>

<TN_ASSET_MMS_RQST>

  <FieldTypes>

    <clsVehicleData class="R">

      <UnitNo type="CHAR"/>

      <BillingCode type="CHAR"/>

      <BillingDesc type="CHAR"/>

      <EquipClass type="CHAR"/>

      <DeptNo type="CHAR"/>

      <UnitID type="CHAR"/>

    </clsVehicleData>

    <PSCAMA class="R">

      <LANGUAGE_CD type="CHAR"/>

      <AUDIT_ACTN type="CHAR"/>

      <BASE_LANGUAGE_CD type="CHAR"/>

      <MSG_SEQ_FLG type="CHAR"/>

      <PROCESS_INSTANCE type="NUMBER"/>

      <PUBLISH_RULE_ID type="CHAR"/>

      <MSGNODENAME type="CHAR"/>