Error while querying inherited class

Hi,

I am using latest version of Telerik Open Access ORM in my ASP.net  C# web application. 
In my EntitiesModel1.rlinq , I have  mapped a table named "Customer " from a database. Then I have created a domain class named "SubCustomer" and added anew property field named "SubName : String" into it. Then deleted default property filed from the domain class. Then I have applied inheritance for Customer-sub customer classes. So the inheritance arrow pointing from  SubCustomer to Customer entity now.
  
I have then applied vertical inheritance stuff to SubCustomer class and mapped "SubName" field with "CustomerName" field in Customer Class using "Default mapping". The Update from database model and validate all process have been completed successfully without having any error or warning.

While deploying  this context in my web application and querying like :

  using (EntitiesModel1 context = new EntitiesModel1())
            {             
                List<SubCustomer> lstCustomer = (from entity in context.SubCustomer
                                            select entity).ToList();
            }

I am getting an error:

 Error executing query: Telerik.OpenAccess.RT.sql.SQLException: Invalid object name 'SubCustomer.
   at Telerik.OpenAccess.RT.Adonet2Generic.Impl.PreparedStatementImp.executeQuery()
   at OpenAccessRuntime.Relational.conn.PooledPreparedStatement.executeQuery()
   at OpenAccessRuntime.Relational.fetch.FetchResultImp.Execute()
SQL:
SELECT a.[CustomerID] AS COL1, b.[voa_class] AS COL2, a.[SubName] AS COL3, b.

I have tried to query "Customer" entity as well  but getting the same error.
Please help.

Regards,
Praveen.