Unable to connect BW system via SSO(Single Sign on)

Dear All,

I am trying to connect Lumira designer to SAP BW system via an OLAP Connection.

OLAP connection is defined SSO(Single Sign on).

But when everytime i select the datasource it prompts me user credential.Attached is the error.Even if i "Predefine" the connection by providing the user credentials,it throws the same error.

Please let me know if any of you have faced similar issue.

Thanks

Faizan