SECTION 7. Accounting system; forms and books of account

The comptroller shall design and install an accounting system for the commonwealth and prescribe the requisite forms and books of account to be used by each department, office, commission and institution of the commonwealth. No form or book of account other than that prescribed as aforesaid shall be used without the approval of the comptroller. He may revise such forms, books or system from time to time. He shall prepare and distribute a book of instructions covering the use and application of said accounting system for the guidance of the various departments, offices, commissions and institutions of the commonwealth. Such instructions will pertain to the financial accounting of assets, liabilities, fund equities, revenues, and expenses of all funds unless specifically exempted by general or special law.