Under Public Contracts Code 20104.50, a government entity that pays a contractor more than 30 days after receipt of an undisputed payment request must pay the contractor 10% interest on the delayed payment.  However, this decision holds that payment more than 30 days after receipt is not a breach of the construction contract if that contract only incorporates the Public Contracts Code provision by reference.  The section does not ban late payments, it just encourages prompt payment by assessing interest for delay.