Hi Rajeev,
Cluster tables cannot be accessed via SDA as they are logical tables.
Several logical tables are stored in one physical table in database.
As per Pooled and Cluster Tables - Application Development on AS ABAP - SAP Library, it is clearly written that Cluster tables cannot be processed with Native SQL directly in the database.
For example, BSEG is a cluster table and is stored as one physical table called RFBLG.
Using SDA, you can only access RFBLG and not BSEG.
Regards,
Vivek
