Code of Civil Procedure Article 436-26

In cases where an ordinary proceeding or summary proceeding should apply and the court of first instance has erroneously applied a Small-Claim Proceeding, the court of second instance may reverse the original judgment and remand the case to the original court, except in cases provided in the fourth paragraph of Article 436-8 when the party has expressed no objection, or he/she knows or should have known such error but has proceeded orally on the merits without raising any objection.In the case provided in the preceding paragraph, the parties shall be accorded an opportunity to be heard. Where both parties agree that the court of second instance can continue adjudicating the action under a Small-Claim Proceeding, the court shall decide on the case. The judgment provided in the first paragraph may be entered without oral argument.
中文原文 民事訴訟法第436-26條
應適用通常訴訟程序或簡易訴訟程序事件,而第一審法院行小額程序者,第二審法院得廢棄原判決,將該事件發回原法院。
但第四百三十六條之八第四項之事件,當事人已表示無異議或知其違背或可得而知其違背,並無異議而為本案辯論者,不在此限。
前項情形,應予當事人陳述意見之機會,如兩造同意由第二審法院繼續適用小額程序者,應自為裁判。
第一項之判決,得不經言詞辯論為之。

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