Capped is an ordinary commercial usage, meaning "upper permissible limit". You'll read. Expenses are capped at £20 per day; Costs are capped at £20,000 for the project; Project time is capped at 10 hours; Under these conditions, if I spent £30 on any given day, I can still only ask my company for £20. It's a general way of specifying a limit. More @Wikipedia
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