                               <p:column headerText="Comments" >
                                        <h:outputLabel rendered="#{bill.refundedBill ne null}" value="#{bill.refundedBill.comments}" >
                                        </h:outputLabel>
                                        <h:outputLabel  rendered="#{bill.cancelledBill ne null}" value="#{bill.cancelledBill.comments}" >
                                        </h:outputLabel>
                                    </p:column>
            