(a)  The contracting officer shall notify the appropriate contract finance office in writing when amounts claimed for payment are—

(1)  Suspended;

(2)  Disapproved as not being allowable according to contract terms; or

(3)  Not allocable to the contract.

(b)  The contracting officer’s notice forms the basis for the contract finance office to issue GSA Form 533-1, Administrative Difference Statement. Finance will attach a copy of GSA Form 533-1 to each copy of the invoice or voucher from which the deduction has been made, and will include an explanation of the deduction.