What is the test for the principle of functus officio?

Canada (Federal), Canada

The following excerpt is from Canadian Doctors for Refugee Care v. Canada (Attorney General), 2015 FC 149 (CanLII):

The principle of functus officio provides that once a decision-maker has done everything necessary to perfect his or her decision, he or she is then barred from revisiting that decision, other than to correct clerical or other minor errors. The policy rationale underlying this doctrine is the need for finality in proceedings: Chandler v. Alberta Association of Architects, 1989 CanLII 41 (SCC), [1989] 2 S.C.R. 848, at paras. 20-21, [1989] S.C.J. No. 102.

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