Why is my active sprint on project B board B preventing me making my project A sprint active?

[Adam Bang]

We are using company managed projects. The project B has tasks from project A (A-101), project B (B-101) and project C (C-101).

The board filter on project B is:

(project = "A" OR project=B OR project=C) and labels=cross-project

The tasks are in the Sprint for project B, to have 1 sprint that can track "cross-project" work across projects. 

The issue now, that on project A, I cannot make the Sprint for project A active.

The board filter for project A is 

project="A"

[Karan Sachdev · Accepted solution]

Hey @Adam Bang

Sprints are actually associated to boards. Since you're tracking work items across multiple projects here, the same sprint will appear on multiple boards as a shared sprint. Is your Sprint started from a board in the Project A?

If so, it is likely that you have disabled parallel sprints, thus only one sprint can be started from the board.

You may navigate to Settings > Products and enable parallel sprints, then try to start the sprint from the board in project A.

For more details on shared sprints: https://community.atlassian.com/forums/Jira-articles/Knowing-when-you-have-a-Shared-Sprint/ba-p/944613

Thanks!

[Adam Bang · Accepted solution]

I need to enable the use of parallel sprints. 

https://support.atlassian.com/jira-software-cloud/docs/use-parallel-sprints/