实体框架4.1幽灵列

我目前在EF4.1中遇到一些问题。SQL的生成似乎和我期望的基于类生成的内容不匹配。我有以下类（这只是一个较大集合中的一个较小集合，然而，这似乎是我遇到问题的地方）。。。

public class CustomEntityContext : DbContext
{
    public CustomEntityContext()
             :base(ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString) {}
    public DbSet<Person> People { get; set; }
    public DbSet<Occurrence> Occurrences { get; set; }
    public DbSet<OccurrenceSecurity> OccurrenceSecurities { get; set; }
}

[DataContract(IsReference = true)]
[Table("Occurrence")]
public class Occurrence 
{
    [DataMember] public int ID { get; set; }
    [DataMember] public string Number { get; set; }
    [DataMember] public bool? IsMOR { get; set; }
    [DataMember] public bool? IsConfidential { get; set; }
    [DataMember] public int? IncidentID { get; set; }
    [DataMember] public bool? CanPublish { get; set; }
    [DataMember] public bool? IsFeedbackRequired { get; set; }
    [DataMember] public bool? IsRegulatorReport { get; set; }
    [DataMember] public DateTime? RecordedDate { get; set; }
    [DataMember] public DateTime? ReportedDate { get; set; }
    [DataMember] public int? ReportTypeID { get; set; }
    [DataMember] public bool? IsMain { get; set; }
    [DataMember] public bool? IsRejected { get; set; }  
    [DataMember] public string Title { get; set; }
    [DataMember] public byte[] Version { get; set; }
    [DataMember] public string ReportDataXml { get; set; }
    [DataMember] public int? LocationID { get; set; }
    [DataMember, ForeignKey("RecordedByPersonID")] public Person Recorder { get; set; }
    [DataMember, ForeignKey("ReportedByPersonID")] public Person Reporter { get; set; }
}
[DataContract(IsReference = true)]
[Table("OccurrenceSecurity")]
public class OccurrenceSecurity
{
    [DataMember, Key, Column("PersonID", Order = 0)] public int PersonID { get; set; }
    [DataMember, ForeignKey("PersonID")] public Person Person { get; set; }
    [DataMember, Key, Column("OccurrenceID", Order = 1)] public int OccurrenceID { get; set;          
    [DataMember, ForeignKey("OccurrenceID")] public Occurrence Occurrence { get; set; }
}
[DataContract(IsReference = true)]
[Table("Person")]
public class Person 
{
    [DataMember] public int ID { get; set; }
    [DataMember] public string FullName { get; set; }
    //[DataMember] public Occurrence[] RecordedOccurrences { get; set; }
    //[DataMember] public Occurrence[] ReportedOccurrences { get; set; }
    //[DataMember] public OccurrenceSecurity[] OccurrenceSecurities { set; get; } 
}

当我使用Include方法请求OccurrenceSecurities时，我要求同时包括Occurrence和Person。随后，生成的SQL如下。。。

SELECT 
[Extent1].[PersonID] AS [PersonID], 
[Extent1].[OccurrenceID] AS [OccurrenceID], 
[Extent2].[ID] AS [ID], 
[Extent2].[FullName] AS [FullName], 
[Extent3].[ID] AS [ID1], 
[Extent3].[Number] AS [Number], 
[Extent3].[IsMOR] AS [IsMOR], 
[Extent3].[IsConfidential] AS [IsConfidential], 
[Extent3].[IncidentID] AS [IncidentID], 
[Extent3].[CanPublish] AS [CanPublish], 
[Extent3].[IsFeedbackRequired] AS [IsFeedbackRequired], 
[Extent3].[IsRegulatorReport] AS [IsRegulatorReport], 
[Extent3].[RecordedByPersonID] AS [RecordedByPersonID], 
[Extent3].[RecordedDate] AS [RecordedDate], 
[Extent3].[ReportedByPersonID] AS [ReportedByPersonID], 
[Extent3].[ReportedDate] AS [ReportedDate], 
[Extent3].[ReportTypeID] AS [ReportTypeID], 
[Extent3].[IsMain] AS [IsMain], 
[Extent3].[IsRejected] AS [IsRejected], 
[Extent3].[Title] AS [Title], 
[Extent3].[Version] AS [Version], 
[Extent3].[ReportDataXml] AS [ReportDataXml], 
[Extent3].[LocationID] AS [LocationID], 
[Extent3].[Person_ID] AS [Person_ID],               -- Where does this come from?
[Extent3].[Person_ID1] AS [Person_ID1]              -- Where does this come from?
FROM   [dbo].[OccurrenceSecurity] AS [Extent1]
INNER JOIN [dbo].[Person] AS [Extent2] ON [Extent1].[PersonID] = [Extent2].[ID]
LEFT OUTER JOIN [dbo].[Occurrence] AS [Extent3] ON [Extent1].[OccurrenceID] = [Extent3].[ID]

正如您所看到的，在Select块的末尾有两列，分别选择Person_ID和Person_ID1。这些不存在于我的底层表或对象中。

有人知道这些东西从哪里来，为什么会在那里吗？

此外，我知道这是一种多对多的关系，然而，OccurrenceSecurities表/类将扩展以容纳更多数据。

谢谢，David