The distinction most errors turn on
What establishments most often get wrong here is conflating two entirely different things: recovering pay for time not worked, and imposing a disciplinary fine.
The first is not a penalty at all. Wages are consideration for work, so an employee absent a day without excuse does not earn that day's pay, and withholding it is not a sanction but an application of the consideration rule. It therefore falls outside the cap on fines.
The second is a disciplinary penalty for the breach itself, set out in the schedule of violations and penalties, and it carries a strict cap. Conflating them means the establishment either deducts less than it lawfully may, or exceeds the cap and commits a breach of its own.