A Memorandum of Agreement recording acceptance of liability for a work injury does not estop an employer from subsequently contending that the worker's incapacity has ceased, because estoppel by judgment does not extend to a subsequent and distinct issue of whether a state of affairs has changed. A Form 5 notice of cancellation under s 69 of the Work Health Act need not use the precise statutory words and may be read together with accompanying letters and medical certificates to assess compliance. Medical certificates dated approximately three weeks before the notice of decision are sufficiently contemporaneous.
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