Requirements for supporting documentation for disbursements shall be determined as follows:
(1) In connection with purchasing procedures, the Chief Fiscal Officer of the State shall prescribe and define the necessary documents and other evidence which shall be retained by the agency for the purpose of determining whether the proper purchasing procedures have been complied with;
(2) In all instances where the evidences of indebtedness are represented by vendor's invoices, the agency shall retain in the permanent file of the business office of the agency the original invoice and corresponding documentation of actual payment in accordance with procedures established by the Chief Fiscal Officer of the State;
(3) In connection with printing contracts, provided by the Arkansas Constitution and laws of this state, the supporting documentation shall be those prescribed by the Auditor of State or by the Department of Finance and Administration, as appropriate;
(4) In connection with the laws or rules governing travel, where individuals are reimbursed for expenses incurred for travel in connection with their official duties, the supporting papers shall be the forms or statements of such expenses prescribed by the Chief Fiscal Officer of the State. In the case of per diem or other expenses established by law, the disbursing officer shall attach to the voucher issued in payment of such allowances a citation of his or her authority for making such payments;
(5) Any indebtedness or expense incurred in connection with an approved resolution of any state board or commission shall be made a part of the permanent minutes of such board or commission, and copies of such resolution or minutes authorizing any indebtedness or expense shall be attached to the voucher issued in payment of any such indebtedness or expense; and
(6) In instances where the General Assembly has authorized grants to public schools, public welfare recipients, counties, municipalities, and for other purposes specifically provided by law, for payments made to individuals under retirement systems, and for income tax refunds, the Chief Fiscal Officer of the State shall prescribe the forms of the vouchers to be used and the procedure to be followed in making such payments.