4. The attestation of a contractor referred to in the first paragraph of section 2 must not have been issued more than 90 days before the date and time fixed for the closing of tenders, or after that date and time, or, in the case of a contract entered into by mutual agreement, more than 90 days before the contract is entered into.
The attestation of a subcontractor referred to in the second paragraph of section 2 must not have been issued more than 90 days before the date fixed for the closing of tenders related to a contract referred to in the first paragraph of section 2, or after that date and time, or, in the case of a contract entered into by mutual agreement, more than 90 days before the day on which the subcontract is entered into.