New report book will only accept one data source

Hi All

About to raise an SR - but thought would check others first.

Can anyone create a report book and include a report with two data sources, we have existing books that work fine, however unable to create a new one.

Guessing it must be as at last patch, we can no longer create a book with multiple reports that connect to different cubes. When adding we get the error:

Data source name xxxxx is not found in the allowed list of data sources.

And we are unable to add another data source in mange data sources - there is no option.