led="#{p.cancelled eq true}">
                                </p:commandButton>
                            </p:column>

                            <p:column headerText="Issued">                   
                                <p:dataTable var="b" value="#{p.listOfBill}">                           
                                    <p:column  >                                                               
                                        <h:outputLabel  value="#{b.deptId}"/>                  