EF Code First外键必须映射到概念方面参与外键关联的某些AssociationSet或EntitySets

我们希望将项目从Database-First迁移到Code-First . 对于此任务，我使用Visual Studio中的数据库生成器的Code First . 我有一些连接PK和FK的表 . 我无法将它们更改为一个简单的“ID”，因为有一个遗留应用程序需要这种方式 . EF版本是6.1.3

当我启动我的程序时，我收到以下错误：

（1568,10）：错误3015：从第1568行，第1583行开始映射片段时出现问题：从表tblAngebRech（RechNr，RechPosNr，CompanyID）到表tblRechnungPosition（RechNr，CompanyID，PosNr）的外键约束'tblRechnungPosition_tblAngebReches'::不足mapping：外键必须映射到概念方面参与外键关联的某些AssociationSet或EntitySets .

我无法弄清楚导致错误的原因，对我而言，所有关系似乎都是正确的 .

以下是课程：

public partial class tblAngebRech
{
    [Key]
    [Column(Order = 0)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int AngebotID { get; set; }

    [Key]
    [Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int AngebPosNr { get; set; }

    [Key]
    [Column(Order = 2)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int RechNr { get; set; }

    [Key]
    [Column(Order = 3)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int RechPosNr { get; set; }

    [Key]
    [Column(Order = 4)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int CompanyID { get; set; }

    public DateTime Timestamp { get; set; }

    public virtual tblAngebotPosition tblAngebotPosition { get; set; }

    public virtual tblRechnungPosition tblRechnungPosition { get; set; }
}

.

public partial class tblRechnungPosition
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public tblRechnungPosition()
    {
        tblAngebReches = new HashSet<tblAngebRech>();
        tblBeauftReches = new HashSet<tblBeauftRech>();
        tblRechPosMitarbs = new HashSet<tblRechPosMitarb>();
    }

    [Key]
    [Column(Order = 0)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int RechNr { get; set; }

    [Key]
    [Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int CompanyID { get; set; }

    [Key]
    [Column(Order = 2)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int PosNr { get; set; }

    public int PosTypID { get; set; }

    public int? StdKeyID { get; set; }

    public double Menge { get; set; }

    public double Betrag { get; set; }

    [Required]
    [StringLength(100)]
    public string Bezeichnung { get; set; }

    public DateTime Timestamp { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<tblAngebRech> tblAngebReches { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<tblBeauftRech> tblBeauftReches { get; set; }

    public virtual tblPositionstyp tblPositionstyp { get; set; }

    public virtual tblRechnung tblRechnung { get; set; }

    public virtual tblStundenKey tblStundenKey { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<tblRechPosMitarb> tblRechPosMitarbs { get; set; }

这是从 protected override void OnModelCreating(DbModelBuilder modelBuilder)

modelBuilder.Entity<tblRechnungPosition>()
    .HasMany(e => e.tblAngebReches)
    .WithRequired(e => e.tblRechnungPosition)
    .HasForeignKey(e => new { e.RechNr, e.CompanyID, e.RechPosNr });

任何帮助，将不胜感激 .