David Cullinane (Waterford, Sinn Fein) | Oireachtas source

That would be the normal practice in the situation. That would be a matter for the Workplace Relations Commission. If a company were to say it is economically unviable for me to do this but they are actually employing people for those hours anyway, then the responsibility would be on them to prove that they could not do this economically. How that is worked out would be an issue for adjudication by the Workplace Relations Commission.