getting Null value on assigned to

Hi developers 

need help whats wrong here why im getting null value on assigned to field from parent table (even there is value from parent request) which will be populated on change request . Assignment group and category is populating correctly while requested by field is null. 

Tia.

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function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (newValue === '') {
        return;
    }
	
	var parent = g_form.getReference('parent') ;
	
    if (parent && parent.sys_class_name === 'sc_req_item') {
 var ga = new GlideAjax('epsChangeUtilstest');
    ga.addParam('sysparm_name', 'checkParentItem');
    ga.addParam('sysparm_parent', parent);
    ga.getXML(getResponse);
}
}



function getResponse(response) {
	//console.log("### this is result ", response);
    var answer = response.responseXML.documentElement.getAttribute('answer');
	//g_form.addInfoMessage('getResponse() = ' + parent + ', answer = ' + answer);
    if (answer !="false") {
        g_form.setValue("category", "Hardware");
		g_form.addInfoMessage('##Setting assigned_to ' + answer);
		g_form.setValue("requested_by",answer); //assigned_to
		//console.log("## assigned to", + answer + assigned_to);
		g_form.setValue("assignment_group","08a531782feb51507fcffe7cf699b682");
    }
}



===========
script include
===========
checkParentItem: function() {
        var parent = this.getParameter("sysparm_parent");
        var ritm = new GlideRecord("sc_req_item");
		ritm.addQuery('sys_id',parent);
		ritm.addQuery('sys_class_name', 'sc_req_item');
        ritm.query();
        if (ritm.next()) {		
			if (ritm.cat_item == '03c78de49f331200d9011977677fcf9f' || ritm.cat_item == '04b7e94b4f7b4200086eeed18110c7fd') {		
          //return ritm.assigned_to;
		return ritm.assigned_to.getValue();
        } else {
            return false;
        }}},