re: allows contractual terms to overrule its national legislation.
In the US it can get a bit murky, but that depends entirely on both parties negotiating the terms of the contract. 'Take it or leave it' style "contracts require that a "reasonable person" would agree to the terms if openly negotiated. I don't think this one passes that test. Then again, we are talking about lawyers, so the "reasonable person" standard seems to be a bit of an oxymoron.