A requisition for the payment of personal services shall, upon receipt by the director of the budget, be checked against the personnel schedule of the spending unit making the requisition. The director shall approve a requisition for personal services only if the amounts requested are in accordance with the personnel schedule of the spending unit: Provided, That the director of the budget is not required to verify or approve requisitions for the payment of personal services for any spending unit that does not participate in the human resource payroll module of the West Virginia Enterprise Resource Planning System as set forth in section one, article six-d, chapter twelve of this code.