I have 3 classes that I want to relate from many to many with EF and we have this:

     public class ClsPermisos: ComponenteBase
      {
         [Key]
         [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
         public Byte Codigo { get; set; }
         public ICollection<ClsPermisoModuloPerfil> PermisoModuloPerfil { get; set; }

    public class ClsModulosPerfiles
       {
         public Int64 Codigo { get; set; }
         public Byte CodigoPerfil { get; set; }
         public Byte CodigoModulo { get; set; }
         public ClsPerfil Perfil { get; set; }
         public ClsModulos Modulo { get; set; }

         public ICollection<ClsPermisoModuloPerfil> PermisoModuloPerfil { get; set; }

    public class ClsPermisoModuloPerfil
      {
        public Int64 CodigoModuloPerfil { get; set; }
        public Byte CodigoPermiso { get; set; }
        public Int64 Codigo { get; set; }

        public ClsPermisos Permiso { get; set; }
        public ClsModulosPerfiles ModuloPerfil { get; set; }
     }

modelBuilder.Entity ()                 .HasKey (mp = > new {mp.CodigoModuloPerfil, mp.CodigoPermiso});

        modelBuilder.Entity<ClsPermisoModuloPerfil>().Property(mp => mp.Codigo)
           .HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity);

        modelBuilder.Entity<ClsPermisoModuloPerfil>()
            .HasRequired(mp => mp.Permiso)
            .WithMany(p => p.PermisoModuloPerfil)
            .HasForeignKey(mp => mp.CodigoPermiso);

        modelBuilder.Entity<ClsPermisoModuloPerfil>()
            .HasRequired(mp => mp.ModuloPerfil)
            .WithMany(m => m.PermisoModuloPerfil)
            .HasForeignKey(mp => mp.CodigoModuloPerfil);

When trying to send the changes I get the following error and I do not know what I'm doing wrong.

  

ClsPermisoModuloPerfil_ModuloPerfil_Target_ClsPermisoModuloPerfil_ModuloPerfil_Source:   : The number of properties in the Dependent and Principal Roles in a   relationship constraint must be identical.