rtBy="#{bill.cancelled}" styleClass="averageNumericColumn">
                                        <h:outputLabel value="#{bill.cancelled?'Yes':'No'}" >
                                            <f:convertNumber pattern="#,##0.00"/>
                                        </h:outputLabel>
                                    </p:column> 
                                    <p:column headerText="Refunded" 
                                              sortBy="#{bill.netTotal}" 
                            