21.18. An enterprise that enters into a contract with a public body or that enters into a public subcontract must hold an authorization on the date the contract or subcontract is entered into. In the case of a consortium, every enterprise in the consortium must hold an authorization on that date.
Moreover, an enterprise that responds to a call for tenders for a public contract or subcontract must hold an authorization on the date it submits its bid, unless the call for tenders specifies a different date which precedes the date the contract is entered into.
An authorization must be maintained throughout the contract or subcontract.