Hello @Dennis Celen
Sprints don't "belong" to projects.
Sprints are created in a Scrum Board.
However, a sprint created in Board A might also display in Board B.
Jira does not restrict which issues can be added to a sprint. For a sprint created in Board A, Jira would not prevent you adding issues to the sprint where those issues are not part of Board A. One could add issues to a Sprint by directly editing the Sprint field in the issue.
A Sprint will display in a given Scrum board if either of these conditions are met:
1. The sprint was created in that board, or
2. The sprint has issues assigned to it that are within the scope of the boards filter.
Here's an example:
Board A has as its filter this: project=ProjectX
Board B has as its filter this: project=ProjectZ
In Board A, Sprint "A-1" is created. At this point a sprint named "A-1" displays only in Board A and has no issue in it.
Somebody is viewing the details of issue ProjectZ-1. They edit the Sprint field in issue ProjectZ-1 and set it to "A-1".
Now when we view Board B (which includes issues from ProjectZ) we see that it also shows a sprint named "A-1" and the sprint contains issue ProjectZ-1.
When we view Board A, we still see sprint "A-1" there and it appears to be empty. That is because Board A uses a filter that gets issues only from ProjectX. It will only show issues from ProjectX that are in the sprint. It can't show that ProjectZ-1 issue is in the sprint.
The one sprint "A-1" is now showing up in two boards, but it is still just one sprint. If you change the sprint name in one board, that will update what is displayed in the other board too.
If you have two boards that reference the same or overlapping issues, that is another scenario where a Sprint might show up in two boards.
There are a few things you can do to address this:
1. Set up the board filters so that they don't display the same issues.
2. Make sure that your sprint names clearly indicate the board where they were created, so that people will be less inclined to use mistakenly assign them to issues outside the scope of that board.
If you are in a situation where you have the sprint displayed in two boards and you want to figure out in which board it was created, you will need to remove all the issues from the sprint. Then it will display in only the board where it was originally created.
You would need to use the Advanced Issue Search screen to search for issues included in that sprint to get a complete list of those issues.
sprint = <your sprint name>
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