Border" scrollHeight="250"
                                                 var="bi" value="#{purchaseOrderController.billItems}"
                                                 id="itemList" sortBy="#{bi.searialNo}"  rowKey="#{bi.searialNo}"
                                                 paginator="true" 
                                                 rows="10" 
                                                 selectionMode="multiple"
                                                 paginatorPosition=