Insurance Code (usually included in commercial codals)
Section 156. A valuation in a policy of marine insurance in conclusive between the parties thereto in the adjustment of either a partial or total loss, if the insured has some interest at risk, and there is no fraud on his part; except that when a thing has been hypothecated by bottomry or respondentia, before its insurance, and without the knowledge of the person actually procuring the insurance, he may show the real value. But a valuation fraudulent in fact, entitles the insurer to rescind the contract.