在EFCore中，我何时需要在值对象中添加[Owned]特性？

报错内容：System.InvalidOperationException:“The entity type 'xxx' cannot be configured as owned because it has already been configured as a non-owned. If you want to override previous configuration first remove the entity type from the model by calling 'Ignore'.

原因：我在实体中添加了一个值对象。值对象如下：

有一个枚举类型的属性Weekday，由于显式得未配置 [Owned] 特性 导致报错 

    public class WeeklyLoopTimeStamp:ValueObject
    {
        // 日期
        public DayOfWeek Weekday
        {
            get; set;
        }
        // 时间
        public DateTime TimePoint
        {
            get; set;
        }

        protected override IEnumerable