                            <p:columnGroup type="header">
                                <p:row>
                                    <p:column rowspan="2" headerText="No" style="padding: 1px;" width="2em"/>
                                    <p:column rowspan="2" headerText="Transaction Type" style="padding: 1px;" width="8em"/>
                                    <p:column rowspan="2" headerText="Bill No" style="padding: 6px;" width="8em"/>
                                    <p:column rowspan="2" headerT