The Union referred a grievance to arbitration beyond the time limits set out in the collective agreement.
The Employer raised a preliminary objection regarding timeliness.
The Union argued the Employer waived its right to object by failing to raise the issue in a timely manner and by taking fresh steps, including participating in mediation and scheduling hearing dates.
The Grievance Settlement Board found that the Employer's general reservation of rights was insufficient notice of a timeliness objection.
Because the Employer waited many months before specifying its objection, it waived its right to object.
The preliminary objection was dismissed.