  </p:column>  
                                </p:row>  
                            </p:columnGroup>  

                        </p:dataTable>

                        <p:spacer height="30"/>

                        <p:dataTable id="cancelled"  value="#{commonReport.purchaseCancelled.bills}" var="b1"  
                                     rendered="#{commonReport.purchaseCancelled.bills.size()!=0}" >
                            <f:facet name="header">  
                                <h:outputLabel val