Deleting issues
Only delete issues if they are not needed. If an issue is a duplicate, you can merge it with another issue. See Merging issues. If you want to keep a record of the issue but it does not need to be fixed, you may be able to add a workflow event to close it. See Adding workflow events to items.
You cannot delete issues that are in public folders that you do not have permission to modify or are locked, or locked private folders.
1. In the Issues list, click 
next to the issue and choose Delete.
You are prompted to confirm the deletion.
2. Click
The issue is deleted.