Mich. Comp. Laws § 17.55

Sec. 5. (1) Section 4 shall not apply if a payment is delayed because of a good faith disagreement between a principal executive department and a private enterprise, unless the dispute is resolved in favor of the private enterprise. (2) Section 4 shall not apply if a payment by a principal executive department is past due because of an executive order budget cut. (3) Section 4 shall not apply if a principal executive department pays a penalty or interest payment charged by a private enterprise for late payment.