When adding an existing revenue that is a type of event registration to an opportunity, the status does not automatically update to accepted.
We are currently evaluating this issue for a fix in a future service pack.
Steps to Duplicate
1. Search for a constituent that is a prospect 2. Click the prospect tab 3. Click the plan tab 4. Select the plan 5. Click the opportunities tab 6. Click 'Go to opportunity' 7. Click the Associated Revenue tab 8. Click Add - Existing Revenue 9. Search for a constituent with an event registration payment 10. Select an event registration revenue 11. Go back to the Details tab 12. See - Status: Unqualified