28 boards, bureaus, and offices. He shall ensure that laws are faithfully executed. SEC. 21. Fiscal Year; Submission of Budget. – The fiscal year of the autonomous region shall cover the period January 1 to December 31 of every year. (a) Regional Budget. The Regional Governor shall submit to the Regional Assembly not later than two (2) months before the beginning of every regular session, as the basis of the regional appropriations bill, a budget of expenditures and sources of financing, including receipts from existing and proposed revenue measures. (b) Regional Assembly Power Over Budget. The Regional Assembly may not increase the appropriations recommended by the Regional Governor for the operation of the autonomous government as specified in the budget. The form, content, and manner of preparation of the budget shall be prescribed by law enacted by the Regional Assembly. Pending the enactment of such law, the budgeting process shall be governed by existing laws and rules and regulations prescribed by the Department of Budget and Management. (c) Prohibition Against Riders. No provision or enactment shall be embraced in the regional appropriations bill unless it relates specifically to some particular appropriation therein. Any such provision or enactment shall be limited in its operation to the appropriation to which it relates. (d) Procedure for Approval. In approving appropriations for its own operations, the Regional Assembly shall strictly follow the procedure for approving the appropriations for the other departments and agencies of the Regional Government. (e) Specific Purpose and Availability of Funds. A special appropriations bill shall specify the purpose for which it is intended and shall be supported by funds actually available or to be raised by a corresponding revenue proposal as certified to by the treasurer of the Regional Government.