Hi Zahid - this application has more than one query, correct?
can you try if the authorization issue is occuring also when you have one query only per applications?
Reason I ask is, when using design studio, all queries are executed with merged variables and then I belive the authorisation context is different. I assume you have some special customer exit in the system for the authorisation check - and in case of design studio this can get into a point where the constellation is not authorized.
In such cases you would need to run authorisation trace (I would need to search the transaction).
Regards, Karol