(a) In any case where the Comptroller determines that a voucher delivered to his offices is not an approvable voucher because of a defect in the invoice or the voucher submitted by the contractor or the agency, he shall either:

1. (1) make the appropriate adjustment to the invoice or voucher; or
2. (2) reject the voucher and return it to the agency.

(b) Where an unapprovable voucher is corrected, as described in paragraph (a)(1) of this section, the MIR date shall not be changed, but the Comptroller may make an appropriate adjustment to the date of receipt of an approvable voucher.

1. (1) Where the Comptroller rejects a voucher he shall, on the same day that he returns the voucher to the agency, send notification to the contractor that the voucher has been rejected and returned to the agency for further information.
2. (2) Where a voucher is rejected pursuant to paragraph (a)(2) of this section because of a defect in the invoice submitted by the contractor, upon correction of the invoice, the MIR date of the corrected invoice shall be determined pursuant to section 18.14 of this Part.
3. (3) Where a voucher is rejected pursuant to paragraph (a)(2) of this section because of an error in the voucher submitted by the agency, the MIR date shall not be changed, but the date of receipt of an approvable voucher shall be the date that the voucher, properly adjusted, is received by the Comptroller.

(c)