Credits to the operating revenue accounts shall be made on the basis of the net tariff rates. Discounts forfeited for delayed payments, shall be credited to account 612, Customers' Forfeited Discounts. Corrections of overcharges and overcollections theretofore credited, authorized abatements and allowances, and other corrections shall be charged to the revenue accounts to which they relate.
N.Y. Comp. Codes R. & Regs. Tit. 16 § 466.2