I must agree with Sef's idea to either add to BSVW or use a temp workfile. Since that fetched field is not in your sort, you have the potential of that field changing with every fetch. Maybe that's OK for your application, but with that 'change' potential on every fetch, I would think the report could be misleading. For example:
BV1 BV2 Fetched field
----- ----- ----------------
1 A John
1 B Jim
1 C John
1 D Jim
On your report, you would have multiple instances of each fetched field with each having a separate count. 'John' would be listed twice, each with a count of 1. Same goes for 'Jim'.
Just something to think about...like I said, maybe that's ok in your app.