The Enforcement Rules of the Ship Registration Law Article 31

Upon closing registration, the person in charge shall record the cause and date of closing, with his title chop affixed, in the part of "Indications of Ship", and delete the ship's indications and registration number, meanwhile, depict the cause in the remark column of the index book.
中文原文 船舶登記法施行細則第31條
截止登記時,應將截止之事由及其年、月、日,記載於船舶標示部內,由主辦人員加蓋職名章,並將船舶之標示及登記號數塗銷之。
同時於索引簿之備考欄內,記明其事由。

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