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 award date. The fact that the contractor holds an attestation is considered to be an eligibility requirement for tendering.
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, nor after the date on which the subcontract is entered into or, if the contract referred to in the first paragraph of section 2 is entered into by mutual agreement, more than 90 days before the date on which the subcontract is entered into.