Cherwell Community

How to check the Business Object's external data mapping?

In our Cherwell System Version 8.1.0,  the Business Object "computer" ,When click "Map to external data...."   It will show  "Computer is already mapped to external data, Overwrite existing mapping?" .  My question is wow do I find the business object "computer" has been mapped to external data.  which external table, or view, etc. ?