What is the applicable test in reviewing a decision of a prothonotary?

Canada (Federal), Canada

The following excerpt is from Pfizer Canada Inc. v. Canada (Minister of Health), 2004 FC 1526 (CanLII):

The applicable test in reviewing a decision of a prothonotary upon appeal is set out in Canada v. Aqua-Gem Investments, supra at p. 454, as follows: ... I am of the opinion that such orders ought to be disturbed on appeal only where it has been made to appear that (a) they are clearly wrong, in the sense that the exercise of discretion by the prothonotary was based upon a wrong principle or upon a misapprehension of the facts, or (b) in making them, the prothonotary improperly exercised his discretion on a question vital to the final issue of the case.

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