Hi Toshiyuki Tega,
You need to specify 'VistaDB' as the backend and a valid connection string in the 'Enable Project' wizard or in the new DSL designer's wizard, in order to use VistaDB as the backend. The wizard adds the required entries to the config file. You do need to manually make any changes for VistaDB.
You should use the 'Enable Project' wizard if you want to Forward map your classes to tables. OpenAccess will apply the default mapping for the fields. You can view this mapping using the Forward mapping dialog.
We have added VistaDB documentation and it will be updated online soon. Is there anything specific that you are looking for?
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