Executive Summary: Key Legal and Evidentiary Issues

• Continental Filing System Inc. sought leave to appeal a Superior Court judgment rejecting its late-filed expert report and refusing to amend its damages claim.
   
• Justice Moore found the expert report was properly rejected given its lateness and irregularities under article 241 C.C.P.
   
• Amendments to the originating application were denied because they depended entirely on the rejected expert report.
   
• Deference applied throughout, as the underlying rulings involved discretionary case-management decisions.
   
• Evidence showed the applicant knew of its new damages theory since March 17, 2025, yet withheld it until near the extended deadline.
   
• Legal costs of $5,000 were upheld against the applicant for the procedural delay caused by the late report.
   

Facts of the case

Continental Filing System Inc. and White Birch Paper Canada Company were engaged in a long-standing contractual relationship in which White Birch supplied cardboard used by Continental to manufacture filing folders. Continental filed its originating application on March 7, 2024, alleging that the cardboard it received had a base weight exceeding what had been indicated. White Birch responded on August 2, 2024, with a defence and a cross-demand for unpaid invoices. Over the following months, three extensions of the case-readiness deadline were granted, with the final extension set for June 30, 2025. Two business days before that deadline, Continental served an expert report that had not previously been disclosed and simultaneously sought to amend its claim, increasing the damages sought from $181,187.11 to $947,437.31 based on that report. White Birch responded by seeking rejection of the report and an award of legal costs, along with a further extension request.

Policy and legislative provisions at issue

The Superior Court's original ruling turned on articles 31, 241, and 342 of the Code de procédure civile, along with article 9(3) governing the interest of justice for leave applications, and article 17 and following on the guiding principles of procedure. Article 241 C.C.P. governs the admissibility requirements for expert reports, while article 342 C.C.P. permits an award of legal costs where a party's conduct causes unnecessary delay or expense. Article 31 C.C.P. sets the threshold for leave to appeal an interlocutory judgment, requiring that the decision resolve part of the dispute or cause irremediable prejudice, including through an evidentiary ruling.

Reasoning and analysis

Justice Moore applied a high standard of deference to the Superior Court's discretionary rulings on case management and evidentiary admissibility. On the expert report, the Court found no basis to intervene: the judge below had reasonably concluded the report was both late and irregular, and had raised legitimate doubts about the expert's field of expertise and impartiality. Because the trial judge had determined that Continental knew of its revised theory of the case since at least March 17, 2025, yet failed to disclose it during the final extension request on April 25, 2025, the appellate court agreed the amendment application was properly refused as bound to fail once the expert report was excluded. Justice Moore also noted the apparent inconsistency in Continental's position — insisting the expert report was necessary to support its increased claim while simultaneously arguing the claim could survive without it through ordinary witness testimony on industry custom. Finally, on the costs award, the Court found no palpable and overriding error, nor any indication the trial judge had exercised discretion improperly.

Ruling and overall outcome

Justice Moore dismissed Continental Filing System Inc.'s application for leave to appeal, concluding that none of the criteria under article 31 C.C.P. were satisfied and that the proposed appeal held no reasonable chance of success. White Birch Paper Canada Company and Société en commandite Stadacona WB, as the successful respondents, were awarded legal costs in connection with the leave application, in addition to the $5,000 in legal costs previously ordered against Continental at first instance under article 342 C.C.P.