Overview of Siebel Tables

The object definition of a Siebel table is a logical representation of the physical table that resides in the underlying RDBMS. Note the following:

You can use an extension table to configure the data objects layer.
You can use an extension column on a base table.
You cannot add a new base table, delete a base table or column, or modify the properties of a base column.

Siebel CRM uses the term base table to describe the following object definitions:

The table that an extension table configures, as defined in the Base Table property of the extension table
The table that a business component references, as defined in the Table property of the business component