New York Codes, Rules and Regulations
Title 2 - DEPARTMENT OF AUDIT AND CONTROL
Chapter I - Audit Of Revenues And Accounts Payable From State Funds And Funds Under Its Control
Part 7 - Purchase Orders, Purchase Contracts, Miscellaneous Service Contracts And Purchase Orders
Section 7.11 - Revision or cancellation of purchase orders

Requests for revision or cancellation of purchase orders on file with the Comptroller shall be submitted on a "Purchase Order Change Notice Form" bearing detailed explanation. Change orders cancelling purchase orders will not be accepted for the purpose of freeing funds. When a cancellation is made with the Comptroller, it must be made with the vendor.