Cannot create books with multiple datasources in EPM Cloud Platform

Summary:

The Books functionality in EPM cloud platform does not allow to add multiple datasources unlike books in NR. Please review and let me know if this is a bug or is there any solution.

Content (please ensure you mask any confidential information):

When we need reports connecting to multiple datasources, we need to add those datasources explicitly to books. It works fine in NR and not in EPM Cloud platform.

Here is a Book where we added two reports, one with ASO connection and other with BSO. As you can see BSO one currently has an error associated, as it cannot find the datasource associated in book.