You mean, in the fourteen days between knowledge and signature, which are meant to protect buyers from "midnight notaries"?
No. I mean that the municipality does not need the notary contract to check whether a right of first refusal exists at all. It is sufficient for the notary to specify that a purchase contract has been concluded for a particular property. If no right of first refusal exists or the municipality has no interest in exercising it, it can already issue the negative certificate. Only in the rare case that one exists and it is considering exercising it does it request the notary contract. This can then be signed by a representative without power of attorney. The contract only becomes effective once the power of attorney is subsequently submitted.