The Administrative Court Organization Act Article 15-5

The court submitting the case may state reasons in a ruling and withdraw the submitted case prior to the conclusion of oral arguments in the Grand Chamber, if and when the status of the said legal dispute has rendered it unnecessary.Before the Grand Chamber announces its judgment, it is possible to state the reasons in a ruling and withdraw the submitted case, if and when there is no need to unify the opinions about the legal dispute concerned.
中文原文 行政法院組織法第15-5條
提案庭於大法庭言詞辯論終結前,因涉及之法律爭議已無提案之必要,得以裁定敘明理由,撤銷提案。
大法庭宣示裁定前,若所涉法律爭議已無統一見解之必要,得以裁定敘明理由,駁回提案。

English translation for reference only; the Chinese text prevails. Not legal advice.