ExecutionListener, end event in the start task

<activiti:executionListener event="end" class="org.alfresco.repo.workflow.activiti.listener.ScriptExecutionListener">
          <activiti:field name="script">
            <activiti:string><![CDATA[for (var i = 0; i < bpm_package.children.length; i++) {

    if (bpm_package.children[i].typeShort == "hrf:pastaLote") {
        execution.setVariable('hrf_empreendimento', bpm_package.children[i].properties["hrf:empreendimento"]);
        execution.setVariable('hrf_quadra', bpm_package.children[i].properties["hrf:quadra"]);
        execution.setVariable('hrf_lote', bpm_package.children[i].properties["hrf:lote"]);

		var description = bpm_package.children[i].properties["hrf:empreendimento"] + " > " +
		bpm_package.children[i].properties["hrf:quadra"] + " > " +
		bpm_package.children[i].properties["hrf:lote"];

	execution.setVariable("bpm_workflowDescription", description);
    }
}]]></activiti:string>
          </activiti:field>
        </activiti:executionListener>