andButton>

                        <p:commandButton value="Excel" ajax="false" >
                            <p:dataExporter type="xlsx" target="tbl" fileName="DepartmentIncome"
                                           
                                                
                                           />
                        </p:commandButton>

                    </f:facet>

                    <p:dataTable id="tbl" rowIndexVar="rowIndex" value="#{investigationController.itemFee}" var="ix"  