Administrative Procedure Act Article 113
An administrative authority is entitled to determine ex officio the invalidity of an administrative disposition.Where the person subject to the administrative disposition or a party affected thereby applies with a good cause for the determination on the invalidity of an administrative disposition, the administrative authority rendering the disposition shall determine whether the disposition is effective or ineffective.
中文原文 行政程序法第113條
行政處分之無效，行政機關得依職權確認之。
行政處分之相對人或利害關係人有正當理由請求確認行政處分無效時，處分機關應確認其為有效或無效。
行政處分之相對人或利害關係人有正當理由請求確認行政處分無效時，處分機關應確認其為有效或無效。