When an extension of validity of bids is considered necessary, those who submitted bids shall be requested in writing to extend the validity of their bids before the expiration date. However, bidders shall not be allowed to modify or revise the price or other substance of their bids.
Bidders shall have the right to refuse to grant such an extension without forfeiting their bid security, but those who are willing to extend the validity of their bid should be required to provide a suitable extension of bid security.