7. Printed receipts to be used
Manuscript receipts of acknowledgments for money shall in no case be issued, but printed forms of acknowledgment taken from books with duplicates and machine-numbered shall be used. A record of such books shall be kept by the Accountant, and a copy supplied to the Auditor General from time to time, as required by him. In cases where it becomes necessary to cancel a receipt, the cancelled form shall not be destroyed but left attached to the duplicates.