Annual Report 2019

144 Sunny Optical Technology (Group) Company Limited • ANNUAL REPORT 2019 FOR THE YEAR ENDED 31 DECEMBER 2019 截至二零一九年十二月三十一日止年度 Notes to the Consolidated Financial Statements 綜合財務報表附註 3. SIGNIFICANT ACCOUNTING POLICIES (Continued) Revenue from contracts with customers The Group recognises revenue when (or as) a performance obligation is satisfied, i.e. when “control” of the goods or services underlying the particular performance obligation is transferred to the customer. A performance obligation represents a good or service (or a bundle of goods or services) that is distinct or a series of distinct goods or services that are substantially the same. Control is transferred over time and revenue is recognised over time by reference to the progress towards complete satisfaction of the relevant performance obligation if one of the following criteria is met: • the customer simultaneously receives and consumes the benefits provided by the Group’s performance as the Group performs; • the Group’s performance creates or enhances an asset that the customer controls as the Group performs; or • the Group’s performance does not create an asset with an alternative use to the Group and the Group has an enforceable right to payment for performance completed to date. Otherwise, revenue is recognised at a point in time when the customer obtains control of the distinct good or service. A contract liability represents the Group’s obligation to transfer goods or services to a customer for which the Group has received consideration (or an amount of consideration is due) from the customer. 3. 重要會計政策（續） 客戶合約收入 當（或於）滿足履約義務時，本集團確認收 入，即於特定履約義務的相關商品或服務 的控制權轉讓予客戶時確認。 履約義務指不同的商品或服務（或一組商品 或服務）或一系列不同的商品或大致相同的 服務。 控制權隨時間轉移，而倘滿足以下其中一 項標準，則收入乃參照完全滿足相關履約 義務的進展情況而隨時間確認： • 隨本集團履約，客戶同時取得並耗用 本集團履約所提供的利益； • 本集團之履約創建或強化資產，該資 產於創建或強化之時即由客戶控制； 或 • 本集團的履約並未產生對本集團有替 代用途的資產，且本集團對迄今已完 成履約之款項具有可執行之權利。 否則，收入於客戶獲得商品或服務控制權 的時間點確認。 合約負債指本集團因已自客戶收取對價（或 已可自客戶收取對價），而須轉讓商品或服 務予客戶之義務。