CCP §1258.210: (a) Not later than the 10th day after the trial date is selected, any party may file and serve on any other party a demand to exchange lists of expert witnesses and statements of valuation data.

(a) Not later than the 10th day after the trial date is selected, any party may file and serve on any other party a demand to exchange lists of expert witnesses and statements of valuation data. Thereafter, the court may, upon noticed motion and a showing of good cause, permit any party to serve such a demand upon any other party. (b) The demand shall: (1) Describe the property to which it relates, which description may be by reference to the complaint. (2) Include a statement in substantially the following form: “You are required to serve and deposit with the clerk of court a list of expert witnesses and statements of valuation data in compliance with Article 2 (commencing with Section 1258.210) of Chapter 7 of Title 7 of Part 3 of the Code of Civil Procedure not later than the date of exchange to be set in accordance with that article. Except as otherwise provided in that article, your failure to do so will constitute a waiver of your right to call unlisted expert witnesses during your case in chief and of your right to introduce on direct examination during your case in chief any matter that is required to be, but is not, set forth in your statements of valuation data.”