Aircraft Flight Operation Regulations Article 181

A Flight Dispatcher who has ceased to exercise the privileges of his/her license for twelve months or more shall not be assigned to such duty unless being given another Flight Dispatcher training by the operator.
中文原文 航空器飛航作業管理規則第181條
簽派員連續停止工作十二個月以上者,非再經航空器使用人訓練不得執行其職務。

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