The Enforcement Rules for the Plant Variety and Plant Seed Act Article 12

If the application form of a plant variety right applicant claiming a priority right is deficient in its statements of information or supporting documents, after the applicant has been notified to remedy such deficiency within a specified time limit, the remedied portion shall be deemed to be already part of the prior claim for priority right application, and the original application date shall be taken to be the application date.
中文原文 植物品種及種苗法施行細則第12條
申請品種權主張優先權者,其申請書之記載事項或證明文件不完備,經通知補正時,該補正部分已見於主張優先權之先申請案,以原申請日為申請日。

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