Tank you Prasad for your helpful information,
When I assigned user to
Grant the right; download connection locally right from:
Connections > User security > Assign Security > Add remove rights > System > relational connection
then error message change
Note client restricted that cannot directly connected back end database from Client machine in QAS and PRD server.
We are able to run adhoc analysis through Web ( http://BOserver:8080/BOE/BI ----> Application Web Intelligence )
Regards