Cal. Sts. & High. Code § 5557

The street superintendent shall record the confirmed reassessment and diagram, in his office, with a certificate at the end thereof executed by the clerk that it is the reassessment approved by the legislative body. He shall also note opposite the several assessments in the original assessment that have been displaced by the reassessment the fact that the reassessment has been made, giving its date and shall credit upon such reassessments all payments theretofore made upon the original assessment or upon the bonds issued to represent the original assessment.