This suggestion has some similarity with Duplicate removal tool/report
But is inherently different.
Here’s the story: we have different teams who in the past shared some credentials to an information portal. With BW, they are placed in different groups (having different collections). Now it appears that a user from each group added the login credentials to their collection. So the same credential (URL, username, password) exist in 2 collections. It would be nice if this could be spotted and notified to BW admin so he can merge these accounts and add the single one to both collections.