Hi Indu,
Which revision of HANA are you currently using. In SPS06 rev 60, the aggregation node is automatically added, but prior to rev 60, it is not mandatory to add EXPLICIT aggregation node.
You can check the output node and create the counter there.
Secondly when you mentioned, that the data preview did not show any data, was there any error. Can you please check the SQL generated (View log, check the SQL generated).
Please add some screenshots to understand the model you created and the SQL statement.
Regards,
Ravi