lue="#{billFee.referenceBillFee.billItem.item.category.name}" />
                            </p:column>
                            
                            <p:column 
                                headerText="Bill Department" 
                                sortBy="#{billFee.referenceBillFee.billItem.bill.toDepartment.name}"
                                filterBy="#{billFee.referenceBillFee.billItem.bill.toDepartment.name}"
                                filterMatchMode="contains"
              