3786285 - OLAP Connection to BW fails with "NULL" when trying to open/create WebI reports after changing the source to a new OLAP Connection.

• After updating the BW version, migrating backend systems (BW Data Sources) to SAP Cloud,  and updating the OLAP connection to the new BW environment, opening or refreshing Web Intelligence reports fails.
• Error message: "failed to connect to the OLAP source. Unexpected exception while calling the SL Service"
• After pointing the report to the new OLAP connection, only NULL appears when opening or creating Web Intelligence reports based on new BW OLAP.
• OLAP Connection works with predefined credentials.
• They are using SSO for connecting to BI and Predefined Credentials to connect to  BW Data Source. 

• SAP BusinessObjects BI Platform 4.3 SP3 Patch 11
• SAP BW 7.5 SP34
• OLAP connections to BW/HANA
• BO on-premise connecting to BW in SAP cloud environment
• Authentication: SSO for BI and  predefined credentials for BW.

Webi, web intelligence, BW, BW olap, sl service, unexpected exception while calling the sl service, null error, sso, predefined credentials, cmc authentication, default system, dsl bridge, sts, bw connection, rise cloud, bo,  , KBA , BI-BIP-AUT , Authentication, ActiveDirectory, LDAP, SSO, Vintela , BI-BIP-SL , Semantic Layer , Problem