03:05:05:02Invoice changes to be made only by vendor --

Exceptions. Invoice changes shall be made only by the vendor unless the change falls within the following exceptions: (1) Sales tax may be deleted; (2) When a vendor refuses to adjust an invoice to reflect the amount actually paid, a signed statement from the department head stating the true price and the refusal of the vendor to state it must accompany the voucher.

Source: 2 SDR 23, effective September 29, 1975.