The union sought a nil wage increase and for the agreement to roll over.
Company changes included removal of a seniority clause, which gave workers with the greatest experience first refusal of jobs at the start of a new season.
The company walked away from negotiations, citing the act's new amendments.
Leave was granted for the appeal on three questions of law: was the Employment Court wrong in finding workers were on employment contracts of indefinite duration, was it wrong to say the Employment Relations Act applied even if there was no relationship between company and workers in the off-season and was it wrong to say Affco's new individual employment contract did not comply with the law.
A date has yet to be determined for the hearing in the Court of Appeal.