Cannot run report in Narrative Reporting that has connection to Oracle ERP by EPM Power User

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1. We are using the EPM only user "BU User" that has Power User Role in EPM instances. In Narrative Reporting, we logged in using a Service Admin ID that has access to ERP and EPM. Then we created a connection to ERP GL Cube using a ERP admin user id. Then we created a report that uses this ERP connection. And then we assigned this report to the "BU User". and now when we log in using the "BU User", it can access the report but cannot open the report. It gives the error message "Report cannot be opened. There