Error in SaveChanges() when EntityTypeMappings has multiple Fragments

Hi, We are having an issue related to #273 We have an inheritance of four levels being RootClass and MiddleClass abstract classes. The problem occurs when we try to add an instance of LeafTwoClass.

DataBase Model

    public class BaseEntity
    {
        public int Id { get; set; }

        //more properties
    }
    public abstract class RootClass:BaseEntity
    {
        public string PropertyOne { get; set; }
        public string PropertyTwo { get; set; }
    }
    public abstract class MiddleClass:RootClass
    {
        public string PropertyThree { get; set; }
    }
    public class LeafOneClass:RootClass
    {
        public string PropertyFour { get; set; }
    }
    public class LeafTwoClass:MiddleClass
    {
        public string PropertyFive { get; set; }
    }

Fluent API Mapping

    public class BaseEntityMap<T> : EntityTypeConfiguration<T>        where T : BaseEntity
    {
        public BaseEntityMap()
        {
            HasKey(t => t.Id);
        }
    }
    public class RootClassMap:BaseEntityMap<RootClass>
    {
        public RootClassMap()
        {
            ToTable("RootClasses");
        }
    }
    public class LeafOneClassMap:BaseEntityMap<LeafOneClass>
    {
        public LeafOneClassMap()
        {
            ToTable("LeafOneClasses");
        }
    }
    public class LeafTwoClassMap:BaseEntityMap<LeafTwoClass>
    {
        public LeafTwoClassMap()
        {
            ToTable("LeafTwoClasses");
        }
    }

DbContext

    public class DataBaseContext:DbContext
    {
        private static DbContextHelper _helper = new DbContextHelper();
        private readonly IAuditDbContext _auditContext;

        public DataBaseContext() : base("DataBaseAuditTests")
        {
            _auditContext = new DefaultAuditContext(this);
            _helper.SetConfig(_auditContext);

            Audit.EntityFramework.Configuration.Setup().ForContext<DataBaseContext>(config =>
            {
                config.IncludeEntityObjects();
                config.IncludeIndependantAssociations();
            }).UseOptOut();
        }

        public override int SaveChanges()
        {
            return _helper.SaveChanges(_auditContext, () => base.SaveChanges());
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Configurations.Add(new RootClassMap());
            modelBuilder.Configurations.Add(new LeafOneClassMap());
            modelBuilder.Configurations.Add(new LeafTwoClassMap());
        }
    }

Exception

Sequence contains more than one element
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at EntityKeyHelper.GetMappingFragment(Type type, DbContext context)
   at EntityKeyHelper.GetTableName(Type type, DbContext context)
   at Audit.EntityFramework.DbContextHelper.GetEntityName(DbContext dbContext, Object entity)
   at Audit.EntityFramework.DbContextHelper.CreateAuditEvent(IAuditDbContext context)
   at Audit.EntityFramework.DbContextHelper.SaveChanges(IAuditDbContext context, Func`1 baseSaveChanges)
  ...

To reproduce the issue we attach a project sample https://github.com/lbouza/AuditTest/tree/master

We are using the next libraries: Audit.Net 17.0.4 Audit.EntityFramework 17.0.4 EntityFramework 6.2

[lbouza]

The feature is working as expected. Thanks for your help and thanks for the library.

[thepirat000]

This was fixed on version 17.0.6.

All tests are passing, please upgrade your references and re-test