索引已存在于具有数据批注的 EF 4.3 代码优先错误中

我正在尝试使用带有数据注释的代码优先使用实体框架 4.3 创建计费数据库，每次尝试创建数据库时都会收到错误。以下是我正在处理的对象：

public class ClientBase
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ClientID { get; set; }
    [Required]
    public string ClientName { get; set; }
    [Required]
    public bool IsActive { get; set; }
    [Required]
    public string ClientContactName { get; set; }
    [Required]
    public string ClientContactEmail { get; set; }
    public virtual List<PropertyBase> Communities { get; set; }
}
public class PropertyBase
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int PropertyID { get; set; }
    [ForeignKey("Client")]
    public int ClientID { get; set; }
    [Required, EnumDataType(typeof(BillingFrequency))]
    public BillingFrequency PropertyBillingFrequency { get; set; }
    [Required]
    public bool IsActive { get; set; }
    [Required]
    public string PropertyName { get; set; }
    public string PropertyStreet { get; set; }
    public string PropertyCity { get; set; }
    public string PropertyState { get; set; }
    public int PropertyZipCode { get; set; }
    public virtual ClientBase Client { get; set; }
}

无论我尝试做什么，我总是收到此错误：

The operation failed because an index or statistics with name 'IX_ClientID' already exists on table 'Property'.

我已经看到了Fluent API的这个问题的解决方案，但我还没有找到数据注释的解决方案。

有人知道如何解决这个问题吗？

编辑：这是DbContext中的代码：

public DbSet<ClientBase> ClientBases { get; set; }
public DbSet<PropertyBase> PropertyBases { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        base.OnModelCreating(modelBuilder);
    }