Class table inheritance and CreatedOn/UpdatedOn error

I have just turned on entity time tracking and it is breaking on entities that use class table inheritance. Note that I have turned it on both for the base entity and the derived entity.

[Test]
public void EntityTracking()
{
  Country cc = new Country();
  cc.Name = "I am going to break";
  UnitOfWork.Add(cc);
  UnitOfWork.SaveChanges();
}

System.Data.SqlTypes.SqlTypeException : SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.
    at System.Data.SqlTypes.SqlDateTime.FromTimeSpan(TimeSpan value)
    at System.Data.SqlTypes.SqlDateTime.FromDateTime(DateTime value)
    at System.Data.SqlClient.MetaType.FromDateTime(DateTime dateTime, Byte cb)
    at System.Data.SqlClient.TdsParser.WriteValue(Object value, MetaType type, Byte scale, Int32 actualLength, Int32 encodingByteSize, Int32 offset, TdsParserStateObject stateObj)
    at System.Data.SqlClient.TdsParser.TdsExecuteRPC(_SqlRPC[] rpcArray, Int32 timeout, Boolean inSchema, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj, Boolean isCommandProc)
    at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
    at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
    at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
    at ...€()
    at ..€(IUnitOfWork , IDbCommand ,
)
    at ..€(IUnitOfWork , IDbCommand )
    at ..€( )
    at ..€(IEnumerable`1 )
    at ..()
    at ..€(ICollection`1 )
    at ..€(UnitOfWorkBase , IEnumerable`1 , IEnumerable`1 )
    at Mindscape.LightSpeed.UnitOfWork.SaveChanges(Boolean reset)
    at Mindscape.LightSpeed.UnitOfWorkBase.SaveChanges()

I did some more testing and have some more info for you: It works when I save a new base entity to the database but not the derived entity.

Thanks for reporting this.  It is not necessary to turn on time tracking at each level of the hierarchy.  Just turn it on in the base class and leave it off in the derived classes.  The derived classes inherit the CreatedOn and UpdatedOn properties so you can still access and query on the time fields through the derived classes.

Ok. Could you add a more user friendly error message in case another developer working with the model does the same thing.