Refresh -BW connection is lost

Report opens properly first time. when the user hits the refresh button Bw server connection is getting lost / breaking .I have to logon the report again. In the report
I have an authorization level hierarchy in the selection parameter.I have created authorization based on " how to do authorization for hiearchy' material.
Please provide some tips.

Hello,
Authorization for hiearchy,
Before you can set authorizations for hierarchies, you must first transfer and activate the InfoObject 0TCTAUTHH from the Business Content. Make sure that the indicator Relevant for Authorization is set. You must also create an authorization object for which you want to set the authorization.
Just go thru this link ,you can find many ways.
Hierarchy Authorization
Procedure: AUthorization types ,definition and level of hierarchy.
http://help.sap.com/saphelp_nw04/helpdata/en/8f/57f438114ee836e10000000a114084/frameset.htm
PDF File for BW reporting Authorization:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/1b439590-0201-0010-ea8e-cba686f21f06
Hope IT HELPS ... !!!
REgards
Varun CN

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ERROR: ORA-01012 NOT LOGGED ON ERROR
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