Enforcement Rules for the Act Governing Relations between Peoples of the Taiwan Area and the Mainland Area Article 9

The substantive probative force of a document presumed to be genuine under Article 7 of the Act shall be determined by the court or the relevant competent authorities.A document shall have substantive probative force when the contents thereof are relevant to the facts to be proved and are credible.Where a document presumed to be genuine is proved false by opposing factual evidence, the presumption does not apply.
中文原文 臺灣地區與大陸地區人民關係條例施行細則第9條
依本條例第七條規定推定為真正之文書,其實質上證據力,由法院或有關主管機關認定。
文書內容與待證事實有關,且屬可信者,有實質上證據力。
推定為真正之文書,有反證事實證明其為不實者,不適用推定。

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