Section 1.705 - Supersession and modification(a) If a D&F is superseded by another D&F, that action shall not render invalid any action taken under the original D&F prior to the date of its supersession.(b) The contracting officer need not cancel the solicitation if the D&F, as modified, supports the contract action.50 FR 1726, 1/11/1985(interim rule), and 50 FR 52429, 12/23/1985(final rule), as amended at 67 FR 13053, 3/20/2002