California Code, Probate Code - PROB § 8852

(a) The personal representative shall take and subscribe an oath that the inventory contains a true statement of the property to be administered in the decedent's estate of which the personal representative has knowledge, and particularly of money of the decedent and debts or demands of the decedent against the personal representative.  The oath shall be endorsed upon or attached to the inventory.

(b) If there is more than one personal representative, each shall take and subscribe the oath.  If the personal representatives are unable to agree as to property to be included in the inventory, any personal representative may petition for a court order determining whether the property is to be administered in the decedent's estate.  The determination shall be made pursuant to the procedure provided in Part 19 (commencing with Section 850) of Division 2 or, if there is an issue of property belonging or passing to the surviving spouse, pursuant to Chapter 5 (commencing with Section 13650) of Part 2 of Division 8.