Hi Cindy,
From our team: As per description, it seems data for which reports need to be created is located inside ER database instead of Perceive database. So reports creation on Perceive data should be linked to 'Perceive Data Source' and reports on ER data should be linked to ER data source. However some ER data get extracted through perceive data extraction process and in that case, data reside on Perceive database also and reports on that would be linked to Perceive Data Source. Data entity on perceive decides what kind of data would be extracted from ER. Perceive does not extract data for Certification Group. So report on that data should be linked to ER data source.