The statements of employment and financial interests and supplementary statements required for employees are in addition to, and not in substitution for, or in derogation of, any similar requirement imposed by law, order, or regulation. The submission of a statement or supplementary statement by an employee does not permit the employee or any other person to participate in a matter in which the employee or the other person's participation is prohibited by law, order, or regulation. Save with respect to those financial interests excepted from the conflict of interest prohibitions of 18 U.S.C. 208(a) pursuant to a written advance determination under §1203.735-217 or exempted by the provisions of §1203.735-205(c), an employee must disqualify himself or herself from participating in any matter in which the employee has a financial interest.