No general plan or diagram of any piece of land shall be accepted in any deeds registry in connection with any registration therein of that land, unless the general plan or diagram has been approved by the Surveyor-General: Provided that, in the event of a general plan having been prepared in terms of any law which regulates the establishment of townships, the Surveyor-General may, at the request of the land surveyor who has signed the general plan, approve it provisionally, and that provisionally approved general plan may be accepted in a deeds registry for the registration of registrable acts in respect of erven indicated thereon, if a certificate has been submitted to the Registrar in which the responsible land surveyor declares that the beacons of the erf or erven to be registered have been placed in positions that correspond with the data appearing on the provisionally approved general plan, and that he or she will submit the final general plan to the Surveyor-General for approval within the prescribed period: Provided further that the land surveyor shall, simultaneously with the submission of the certificate to the Registrar, submit a copy thereof to the Surveyor-General.