Cal. Rev. & Tax. Code § 531.5
If a business inventories exemption has been incorrectly allowed because of erroneous or incorrect information submitted by the taxpayer or his agent misclassifying as business inventories property not includible in "business inventories," as that term is defined in Section 129, an escape assessment in the amount of the exemption shall be made on discovery of the error. Interest shall be added to the assessment in the amount and manner provided by Section 506. If the exemption was incorrectly allowed because of erroneous or incorrect information submitted by the taxpayer or his agent with knowledge that such information was erroneous or incorrect, the penalty provided in Section 504 shall be added to the assessment.
Ca. Rev. and Tax. Code § 531.5