Model:

 [Serializable]
    [HierarchyRoot]
    public class MyEntity : Entity
    {
        [Field, Key]
        public Guid Id { get; private set; }

        [Field(Length = 100)]
        public string Text { get; set; }

        [Association(PairTo = "Owner")]
        [Field]
        public EntitySet<TablePartBaseImpl<MyEntity>> SomeSet { get; set; }

        public MyEntity(Session session)
            : base(session)
        {
        }
    }

    [Serializable]
    [HierarchyRoot]
    public class MyEntitySecond : Entity
    {
        [Field, Key]
        public Guid Id { get; private set; }

        [Field(Length = 50)]
        public string SomeField { get; set; }

        [Association(PairTo = "Owner")]
        [Field]
        public EntitySet<TablePartBaseImpl<MyEntitySecond>> SomeSet { get; set; }

        public MyEntitySecond(Session session)
            : base(session)
        {
        }
    }

    [Serializable]
    public abstract class TablePartBase<TEntity> : Entity where TEntity : Entity
    {
        protected TablePartBase(Session session, TEntity owner) : base(session)
        {
            Owher = owner;
        }

        [Field, Key]
        public Guid Id { get; private set; }

        [Field]
        public TEntity Owher { get; set; }

    }

    [HierarchyRoot]
    [Serializable]
    public class TablePartBaseImpl<TEntity> : TablePartBase<TEntity> 
        where TEntity : Entity
    {
        public TablePartBaseImpl(Session session, TEntity owner) : base(session, owner)
        {
        }

        [Field]
        public string SomeStringField { get; set; }
    }

In recreate mode have exception:

Xtensive.Orm.DomainBuilderException occurred
Message=Type 'ConsoleApplication1.TablePartBaseImpl<ConsoleApplication1.MyEntity>' is not registered in the model.
Source=Xtensive.Orm
StackTrace:
   at Xtensive.Orm.Building.ModelInspector.GetTypeDef(Type type) in d:\Projects\Xtensive\DataObjects.Net\partnership\Xtensive.Orm\Xtensive.Orm\Orm\Building\ModelInspector.cs:line 352

InnerException:

Xtensive.Orm.dll!Xtensive.Orm.Building.ModelInspector.GetTypeDef(System.Type type) Line 354 C#
    Xtensive.Orm.dll!Xtensive.Orm.Building.ModelInspector.InspectField(Xtensive.Orm.Building.Definitions.TypeDef typeDef, Xtensive.Orm.Building.Definitions.FieldDef fieldDef, bool isKeyField) Line 321 + 0x8 bytes    C#
Xtensive.Orm.dll!Xtensive.Orm.Building.ModelInspector.Inspect(Xtensive.Orm.Building.Definitions.TypeDef typeDef) Line 284 + 0xd bytes   C#
Xtensive.Orm.dll!Xtensive.Orm.Building.ModelInspector.InspectTypes() Line 57 + 0x8 bytes    C#
Xtensive.Orm.dll!Xtensive.Orm.Building.ModelInspector.Run() Line 27 + 0x5 bytes C#
Xtensive.Orm.dll!Xtensive.Orm.Building.Builders.ModelBuilder.Run() Line 43 + 0x5 bytes  C#
Xtensive.Orm.dll!Xtensive.Orm.Building.Builders.DomainBuilder.BuildModel() Line 214 + 0x5 bytes C#
Xtensive.Orm.dll!Xtensive.Orm.Building.Builders.DomainBuilder.BuildDomain(Xtensive.Orm.Configuration.DomainConfiguration configuration, Xtensive.Orm.Building.Builders.DomainBuilderConfiguration builderConfiguration) Line 63 + 0x5 bytes C#
Xtensive.Orm.dll!Xtensive.Orm.Upgrade.UpgradingDomainBuilder.BuildStageDomain(Xtensive.Orm.Upgrade.UpgradeStage stage) Line 82 + 0x3a bytes C#
Xtensive.Orm.dll!Xtensive.Orm.Upgrade.UpgradingDomainBuilder.Build(Xtensive.Orm.Configuration.DomainConfiguration configuration) Line 62 + 0xa bytes    C#
Xtensive.Orm.dll!Xtensive.Orm.Domain.Build(Xtensive.Orm.Configuration.DomainConfiguration configuration) Line 281 + 0x8 bytes   C#
ConsoleApplication1.exe!ConsoleApplication1.Program.Main(string[] args) Line 52 + 0x8 bytes C#