webi error as a Bex query data source

Hi All,

I am getting the below error When i try to access Bex query from Webi with OLAP connection as SSO, if it is predefined it works good, for predefined i used Service account for now.

com.businessobjects.sdk.core.server.CommunicationException$UnexpectedServerException: [[error.openSapBwBrowsingSessionFailed] 0] <<?xml version="1.0" encoding="UTF-8" standalone="yes"?><ConnectionString>

   <Properties>

      <Initial Catalog />

      <Language>en_US</Language>

      <Data Source>xyz</Data Source>

      <Cube Type>Unknown</Cube Type>

      <SaveLanguage>true</SaveLanguage>

      <Initial Cube />

      <TargetProvider>SAPNETWEAVER7X</TargetProvider>

      <NetworkLayer>SAPBW_BICS</NetworkLayer>

      <Authentication Mode>2</Authentication Mode>

   </Properties>

   <ExtendedProperties>

      <JCO_ASHOST>xyz</JCO_ASHOST>

      <SapLoginMode>0</SapLoginMode>

      <JCO_R3NAME>bd1</JCO_R3NAME>

      <JCO_CLIENT>300</JCO_CLIENT>

      <JCO_SYSNR>30</JCO_SYSNR>

      <JCO_LANG>EN</JCO_LANG>

   </ExtendedProperties>

</ConnectionString>>

I did configured STS and SAP Authentication tab on CMC.

Please advise

Thank you!!!

kris