In what circumstances will a judge order a motion to set aside a previous order in the administration of the same estate after the same order has become final?

In Security-First National Bank v. Superior Court of Los Angeles (1934) 1 Cal.2d 749, [217 Cal.App.2d 150] page 755, [217 Cal.App.2d 149] 37 P.2d 69, at page 72, the court states: [217 Cal.App.2d 150] '* * * a subsequent application in the administration of the same estate to set aside a previous order entered in the course of probate jurisdiction after the same has become final is a collateral attack, and unless the order is void on its face, it may not on such attack be set aside. [Citations.]'