Administrative Appeal Act Article 76

While the administrative appellant or intervenor appellant has objection(s) to the procedure decision made by the agency with jurisdiction of administrative appeal during the administrative appeal procedure, she/he shall consolidate the procedure decision and the administrative appeal decision to file an administrative litigation.
中文原文 訴願法第76條
訴願人或參加人對受理訴願機關於訴願程序進行中所為之程序上處置不服者,應併同訴願決定提起行政訴訟。

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