                                rendered="#{commonReport.grnBilled.bills.size()!=0}" 
                                     sortBy="#{b.billType}"  >

                            <f:facet name="header"> 
                                <h:outputLabel value="From :" />&nbsp;&nbsp;
                                <h:outputLabel  value="#{commonReport.fromDate}" >
                                    <f:convertDateTime pattern="dd MMMM yyyy HH:mm "/>
                                </h:outputLabel>    
         